ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1 | // Copyright 2006-2009 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 30 | #include "ast.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 31 | #include "execution.h" |
| 32 | #include "factory.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 33 | #include "jsregexp-inl.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 34 | #include "platform.h" |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 35 | #include "runtime.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 36 | #include "top.h" |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 37 | #include "compilation-cache.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 38 | #include "string-stream.h" |
| 39 | #include "parser.h" |
| 40 | #include "regexp-macro-assembler.h" |
| 41 | #include "regexp-macro-assembler-tracer.h" |
| 42 | #include "regexp-macro-assembler-irregexp.h" |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 43 | #include "regexp-stack.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 44 | |
| 45 | #ifdef ARM |
| 46 | #include "regexp-macro-assembler-arm.h" |
| 47 | #else // IA32 |
| 48 | #include "macro-assembler-ia32.h" |
| 49 | #include "regexp-macro-assembler-ia32.h" |
| 50 | #endif |
| 51 | |
| 52 | #include "interpreter-irregexp.h" |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 53 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 54 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 55 | namespace v8 { namespace internal { |
| 56 | |
| 57 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 58 | Handle<Object> RegExpImpl::CreateRegExpLiteral(Handle<JSFunction> constructor, |
| 59 | Handle<String> pattern, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 60 | Handle<String> flags, |
| 61 | bool* has_pending_exception) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 62 | // Ensure that the constructor function has been loaded. |
| 63 | if (!constructor->IsLoaded()) { |
| 64 | LoadLazy(constructor, has_pending_exception); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 65 | if (*has_pending_exception) return Handle<Object>(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 66 | } |
| 67 | // Call the construct code with 2 arguments. |
| 68 | Object** argv[2] = { Handle<Object>::cast(pattern).location(), |
| 69 | Handle<Object>::cast(flags).location() }; |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 70 | return Execution::New(constructor, 2, argv, has_pending_exception); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 74 | static JSRegExp::Flags RegExpFlagsFromString(Handle<String> str) { |
| 75 | int flags = JSRegExp::NONE; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 76 | for (int i = 0; i < str->length(); i++) { |
| 77 | switch (str->Get(i)) { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 78 | case 'i': |
| 79 | flags |= JSRegExp::IGNORE_CASE; |
| 80 | break; |
| 81 | case 'g': |
| 82 | flags |= JSRegExp::GLOBAL; |
| 83 | break; |
| 84 | case 'm': |
| 85 | flags |= JSRegExp::MULTILINE; |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | return JSRegExp::Flags(flags); |
| 90 | } |
| 91 | |
| 92 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 93 | static inline void ThrowRegExpException(Handle<JSRegExp> re, |
| 94 | Handle<String> pattern, |
| 95 | Handle<String> error_text, |
| 96 | const char* message) { |
| 97 | Handle<JSArray> array = Factory::NewJSArray(2); |
| 98 | SetElement(array, 0, pattern); |
| 99 | SetElement(array, 1, error_text); |
| 100 | Handle<Object> regexp_err = Factory::NewSyntaxError(message, array); |
| 101 | Top::Throw(*regexp_err); |
| 102 | } |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 103 | |
| 104 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 105 | // Generic RegExp methods. Dispatches to implementation specific methods. |
| 106 | |
| 107 | |
| 108 | class OffsetsVector { |
| 109 | public: |
| 110 | inline OffsetsVector(int num_registers) |
| 111 | : offsets_vector_length_(num_registers) { |
| 112 | if (offsets_vector_length_ > kStaticOffsetsVectorSize) { |
| 113 | vector_ = NewArray<int>(offsets_vector_length_); |
| 114 | } else { |
| 115 | vector_ = static_offsets_vector_; |
| 116 | } |
| 117 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 118 | inline ~OffsetsVector() { |
| 119 | if (offsets_vector_length_ > kStaticOffsetsVectorSize) { |
| 120 | DeleteArray(vector_); |
| 121 | vector_ = NULL; |
| 122 | } |
| 123 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 124 | inline int* vector() { return vector_; } |
| 125 | inline int length() { return offsets_vector_length_; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 126 | |
| 127 | private: |
| 128 | int* vector_; |
| 129 | int offsets_vector_length_; |
| 130 | static const int kStaticOffsetsVectorSize = 50; |
| 131 | static int static_offsets_vector_[kStaticOffsetsVectorSize]; |
| 132 | }; |
| 133 | |
| 134 | |
| 135 | int OffsetsVector::static_offsets_vector_[ |
| 136 | OffsetsVector::kStaticOffsetsVectorSize]; |
| 137 | |
| 138 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 139 | Handle<Object> RegExpImpl::Compile(Handle<JSRegExp> re, |
| 140 | Handle<String> pattern, |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 141 | Handle<String> flag_str) { |
| 142 | JSRegExp::Flags flags = RegExpFlagsFromString(flag_str); |
| 143 | Handle<FixedArray> cached = CompilationCache::LookupRegExp(pattern, flags); |
| 144 | bool in_cache = !cached.is_null(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 145 | LOG(RegExpCompileEvent(re, in_cache)); |
| 146 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 147 | Handle<Object> result; |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 148 | if (in_cache) { |
| 149 | re->set_data(*cached); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 150 | return re; |
| 151 | } |
| 152 | FlattenString(pattern); |
| 153 | ZoneScope zone_scope(DELETE_ON_EXIT); |
| 154 | RegExpCompileData parse_result; |
| 155 | FlatStringReader reader(pattern); |
| 156 | if (!ParseRegExp(&reader, flags.is_multiline(), &parse_result)) { |
| 157 | // Throw an exception if we fail to parse the pattern. |
| 158 | ThrowRegExpException(re, |
| 159 | pattern, |
| 160 | parse_result.error, |
| 161 | "malformed_regexp"); |
| 162 | return Handle<Object>::null(); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 163 | } |
| 164 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 165 | if (parse_result.simple && !flags.is_ignore_case()) { |
| 166 | // Parse-tree is a single atom that is equal to the pattern. |
| 167 | AtomCompile(re, pattern, flags, pattern); |
| 168 | } else if (parse_result.tree->IsAtom() && |
| 169 | !flags.is_ignore_case() && |
| 170 | parse_result.capture_count == 0) { |
| 171 | RegExpAtom* atom = parse_result.tree->AsAtom(); |
| 172 | Vector<const uc16> atom_pattern = atom->data(); |
| 173 | Handle<String> atom_string = Factory::NewStringFromTwoByte(atom_pattern); |
| 174 | AtomCompile(re, pattern, flags, atom_string); |
| 175 | } else { |
| 176 | IrregexpPrepare(re, pattern, flags, parse_result.capture_count); |
| 177 | } |
| 178 | ASSERT(re->data()->IsFixedArray()); |
| 179 | // Compilation succeeded so the data is set on the regexp |
| 180 | // and we can store it in the cache. |
| 181 | Handle<FixedArray> data(FixedArray::cast(re->data())); |
| 182 | CompilationCache::PutRegExp(pattern, flags, data); |
| 183 | |
| 184 | return re; |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | |
| 188 | Handle<Object> RegExpImpl::Exec(Handle<JSRegExp> regexp, |
| 189 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 190 | int index, |
| 191 | Handle<JSArray> last_match_info) { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 192 | switch (regexp->TypeTag()) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 193 | case JSRegExp::ATOM: |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 194 | return AtomExec(regexp, subject, index, last_match_info); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 195 | case JSRegExp::IRREGEXP: { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 196 | Handle<Object> result = |
| 197 | IrregexpExec(regexp, subject, index, last_match_info); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 198 | ASSERT(!result.is_null() || Top::has_pending_exception()); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 199 | return result; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 200 | } |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 201 | default: |
| 202 | UNREACHABLE(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 203 | return Handle<Object>::null(); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 204 | } |
| 205 | } |
| 206 | |
| 207 | |
| 208 | Handle<Object> RegExpImpl::ExecGlobal(Handle<JSRegExp> regexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 209 | Handle<String> subject, |
| 210 | Handle<JSArray> last_match_info) { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 211 | switch (regexp->TypeTag()) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 212 | case JSRegExp::ATOM: |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 213 | return AtomExecGlobal(regexp, subject, last_match_info); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 214 | case JSRegExp::IRREGEXP: { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 215 | Handle<Object> result = |
| 216 | IrregexpExecGlobal(regexp, subject, last_match_info); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 217 | ASSERT(!result.is_null() || Top::has_pending_exception()); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 218 | return result; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 219 | } |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 220 | default: |
| 221 | UNREACHABLE(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 222 | return Handle<Object>::null(); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 223 | } |
| 224 | } |
| 225 | |
| 226 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 227 | // RegExp Atom implementation: Simple string search using indexOf. |
| 228 | |
| 229 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 230 | void RegExpImpl::AtomCompile(Handle<JSRegExp> re, |
| 231 | Handle<String> pattern, |
| 232 | JSRegExp::Flags flags, |
| 233 | Handle<String> match_pattern) { |
| 234 | Factory::SetRegExpAtomData(re, |
| 235 | JSRegExp::ATOM, |
| 236 | pattern, |
| 237 | flags, |
| 238 | match_pattern); |
| 239 | } |
| 240 | |
| 241 | |
| 242 | static void SetAtomLastCapture(FixedArray* array, |
| 243 | String* subject, |
| 244 | int from, |
| 245 | int to) { |
| 246 | NoHandleAllocation no_handles; |
| 247 | RegExpImpl::SetLastCaptureCount(array, 2); |
| 248 | RegExpImpl::SetLastSubject(array, subject); |
| 249 | RegExpImpl::SetLastInput(array, subject); |
| 250 | RegExpImpl::SetCapture(array, 0, from); |
| 251 | RegExpImpl::SetCapture(array, 1, to); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | |
| 255 | Handle<Object> RegExpImpl::AtomExec(Handle<JSRegExp> re, |
| 256 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 257 | int index, |
| 258 | Handle<JSArray> last_match_info) { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 259 | Handle<String> needle(String::cast(re->DataAt(JSRegExp::kAtomPatternIndex))); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 260 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 261 | uint32_t start_index = index; |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 262 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 263 | int value = Runtime::StringMatch(subject, needle, start_index); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 264 | if (value == -1) return Factory::null_value(); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 265 | ASSERT(last_match_info->HasFastElements()); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 266 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 267 | { |
| 268 | NoHandleAllocation no_handles; |
| 269 | FixedArray* array = last_match_info->elements(); |
| 270 | SetAtomLastCapture(array, *subject, value, value + needle->length()); |
| 271 | } |
| 272 | return last_match_info; |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | |
| 276 | Handle<Object> RegExpImpl::AtomExecGlobal(Handle<JSRegExp> re, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 277 | Handle<String> subject, |
| 278 | Handle<JSArray> last_match_info) { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 279 | Handle<String> needle(String::cast(re->DataAt(JSRegExp::kAtomPatternIndex))); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 280 | ASSERT(last_match_info->HasFastElements()); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 281 | Handle<JSArray> result = Factory::NewJSArray(1); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 282 | int index = 0; |
| 283 | int match_count = 0; |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 284 | int subject_length = subject->length(); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 285 | int needle_length = needle->length(); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 286 | int last_value = -1; |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 287 | while (true) { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 288 | HandleScope scope; |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 289 | int value = -1; |
| 290 | if (index + needle_length <= subject_length) { |
| 291 | value = Runtime::StringMatch(subject, needle, index); |
| 292 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 293 | if (value == -1) { |
| 294 | if (last_value != -1) { |
| 295 | Handle<FixedArray> array(last_match_info->elements()); |
| 296 | SetAtomLastCapture(*array, |
| 297 | *subject, |
| 298 | last_value, |
| 299 | last_value + needle->length()); |
| 300 | } |
| 301 | break; |
| 302 | } |
| 303 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 304 | int end = value + needle_length; |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 305 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 306 | // Create an array that looks like the static last_match_info array |
| 307 | // that is attached to the global RegExp object. We will be returning |
| 308 | // an array of these. |
| 309 | Handle<FixedArray> array = Factory::NewFixedArray(kFirstCapture + 2); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 310 | SetLastCaptureCount(*array, 2); |
| 311 | // Ignore subject and input fields. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 312 | SetCapture(*array, 0, value); |
| 313 | SetCapture(*array, 1, end); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 314 | Handle<JSArray> pair = Factory::NewJSArrayWithElements(array); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 315 | SetElement(result, match_count, pair); |
| 316 | match_count++; |
| 317 | index = end; |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 318 | if (needle_length == 0) index++; |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 319 | last_value = value; |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 320 | } |
| 321 | return result; |
| 322 | } |
| 323 | |
| 324 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 325 | // Irregexp implementation. |
| 326 | |
| 327 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 328 | // Ensures that the regexp object contains a compiled version of the |
| 329 | // source for either ASCII or non-ASCII strings. |
| 330 | // If the compiled version doesn't already exist, it is compiled |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 331 | // from the source pattern. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 332 | // If compilation fails, an exception is thrown and this function |
| 333 | // returns false. |
| 334 | bool RegExpImpl::EnsureCompiledIrregexp(Handle<JSRegExp> re, |
| 335 | bool is_ascii) { |
| 336 | int index; |
| 337 | if (is_ascii) { |
| 338 | index = JSRegExp::kIrregexpASCIICodeIndex; |
| 339 | } else { |
| 340 | index = JSRegExp::kIrregexpUC16CodeIndex; |
| 341 | } |
| 342 | Object* entry = re->DataAt(index); |
| 343 | if (!entry->IsTheHole()) { |
| 344 | // A value has already been compiled. |
| 345 | if (entry->IsJSObject()) { |
| 346 | // If it's a JS value, it's an error. |
| 347 | Top::Throw(entry); |
| 348 | return false; |
| 349 | } |
| 350 | return true; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | // Compile the RegExp. |
| 354 | ZoneScope zone_scope(DELETE_ON_EXIT); |
| 355 | |
| 356 | JSRegExp::Flags flags = re->GetFlags(); |
| 357 | |
| 358 | Handle<String> pattern(re->Pattern()); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 359 | if (!pattern->IsFlat()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 360 | FlattenString(pattern); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | RegExpCompileData compile_data; |
| 364 | FlatStringReader reader(pattern); |
| 365 | if (!ParseRegExp(&reader, flags.is_multiline(), &compile_data)) { |
| 366 | // Throw an exception if we fail to parse the pattern. |
| 367 | // THIS SHOULD NOT HAPPEN. We already parsed it successfully once. |
| 368 | ThrowRegExpException(re, |
| 369 | pattern, |
| 370 | compile_data.error, |
| 371 | "malformed_regexp"); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 372 | return false; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 373 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 374 | RegExpEngine::CompilationResult result = |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 375 | RegExpEngine::Compile(&compile_data, |
| 376 | flags.is_ignore_case(), |
| 377 | flags.is_multiline(), |
| 378 | pattern, |
| 379 | is_ascii); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 380 | if (result.error_message != NULL) { |
| 381 | // Unable to compile regexp. |
| 382 | Handle<JSArray> array = Factory::NewJSArray(2); |
| 383 | SetElement(array, 0, pattern); |
| 384 | SetElement(array, |
| 385 | 1, |
| 386 | Factory::NewStringFromUtf8(CStrVector(result.error_message))); |
| 387 | Handle<Object> regexp_err = |
| 388 | Factory::NewSyntaxError("malformed_regexp", array); |
| 389 | Top::Throw(*regexp_err); |
| 390 | re->SetDataAt(index, *regexp_err); |
| 391 | return false; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 392 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 393 | |
| 394 | NoHandleAllocation no_handles; |
| 395 | |
| 396 | FixedArray* data = FixedArray::cast(re->data()); |
| 397 | data->set(index, result.code); |
| 398 | int register_max = IrregexpMaxRegisterCount(data); |
| 399 | if (result.num_registers > register_max) { |
| 400 | SetIrregexpMaxRegisterCount(data, result.num_registers); |
| 401 | } |
| 402 | |
| 403 | return true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 404 | } |
| 405 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 406 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 407 | int RegExpImpl::IrregexpMaxRegisterCount(FixedArray* re) { |
| 408 | return Smi::cast( |
| 409 | re->get(JSRegExp::kIrregexpMaxRegisterCountIndex))->value(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 413 | void RegExpImpl::SetIrregexpMaxRegisterCount(FixedArray* re, int value) { |
| 414 | re->set(JSRegExp::kIrregexpMaxRegisterCountIndex, Smi::FromInt(value)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 418 | int RegExpImpl::IrregexpNumberOfCaptures(FixedArray* re) { |
| 419 | return Smi::cast(re->get(JSRegExp::kIrregexpCaptureCountIndex))->value(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 423 | int RegExpImpl::IrregexpNumberOfRegisters(FixedArray* re) { |
| 424 | return Smi::cast(re->get(JSRegExp::kIrregexpMaxRegisterCountIndex))->value(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 428 | ByteArray* RegExpImpl::IrregexpByteCode(FixedArray* re, bool is_ascii) { |
| 429 | int index; |
| 430 | if (is_ascii) { |
| 431 | index = JSRegExp::kIrregexpASCIICodeIndex; |
| 432 | } else { |
| 433 | index = JSRegExp::kIrregexpUC16CodeIndex; |
| 434 | } |
| 435 | return ByteArray::cast(re->get(index)); |
| 436 | } |
| 437 | |
| 438 | |
| 439 | Code* RegExpImpl::IrregexpNativeCode(FixedArray* re, bool is_ascii) { |
| 440 | int index; |
| 441 | if (is_ascii) { |
| 442 | index = JSRegExp::kIrregexpASCIICodeIndex; |
| 443 | } else { |
| 444 | index = JSRegExp::kIrregexpUC16CodeIndex; |
| 445 | } |
| 446 | return Code::cast(re->get(index)); |
| 447 | } |
| 448 | |
| 449 | |
| 450 | void RegExpImpl::IrregexpPrepare(Handle<JSRegExp> re, |
| 451 | Handle<String> pattern, |
| 452 | JSRegExp::Flags flags, |
| 453 | int capture_count) { |
| 454 | // Initialize compiled code entries to null. |
| 455 | Factory::SetRegExpIrregexpData(re, |
| 456 | JSRegExp::IRREGEXP, |
| 457 | pattern, |
| 458 | flags, |
| 459 | capture_count); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | |
| 463 | Handle<Object> RegExpImpl::IrregexpExec(Handle<JSRegExp> regexp, |
| 464 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 465 | int index, |
| 466 | Handle<JSArray> last_match_info) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 467 | ASSERT_EQ(regexp->TypeTag(), JSRegExp::IRREGEXP); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 468 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 469 | // Prepare space for the return values. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 470 | int number_of_capture_registers = |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 471 | (IrregexpNumberOfCaptures(FixedArray::cast(regexp->data())) + 1) * 2; |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 472 | OffsetsVector offsets(number_of_capture_registers); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 473 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 474 | int previous_index = index; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 475 | |
| 476 | #ifdef DEBUG |
| 477 | if (FLAG_trace_regexp_bytecodes) { |
| 478 | String* pattern = regexp->Pattern(); |
| 479 | PrintF("\n\nRegexp match: /%s/\n\n", *(pattern->ToCString())); |
| 480 | PrintF("\n\nSubject string: '%s'\n\n", *(subject->ToCString())); |
| 481 | } |
| 482 | #endif |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 483 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 484 | if (!subject->IsFlat()) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 485 | FlattenString(subject); |
| 486 | } |
| 487 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 488 | last_match_info->EnsureSize(number_of_capture_registers + kLastMatchOverhead); |
| 489 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 490 | return IrregexpExecOnce(regexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 491 | number_of_capture_registers, |
| 492 | last_match_info, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 493 | subject, |
| 494 | previous_index, |
| 495 | offsets.vector(), |
| 496 | offsets.length()); |
| 497 | } |
| 498 | |
| 499 | |
| 500 | Handle<Object> RegExpImpl::IrregexpExecGlobal(Handle<JSRegExp> regexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 501 | Handle<String> subject, |
| 502 | Handle<JSArray> last_match_info) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 503 | ASSERT_EQ(regexp->TypeTag(), JSRegExp::IRREGEXP); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 504 | |
| 505 | // Prepare space for the return values. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 506 | int number_of_capture_registers = |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 507 | (IrregexpNumberOfCaptures(FixedArray::cast(regexp->data())) + 1) * 2; |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 508 | OffsetsVector offsets(number_of_capture_registers); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 509 | |
| 510 | int previous_index = 0; |
| 511 | |
| 512 | Handle<JSArray> result = Factory::NewJSArray(0); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 513 | int result_length = 0; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 514 | Handle<Object> matches; |
| 515 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 516 | if (!subject->IsFlat()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 517 | FlattenString(subject); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 518 | } |
| 519 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 520 | last_match_info->EnsureSize(number_of_capture_registers + kLastMatchOverhead); |
| 521 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 522 | while (true) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 523 | if (previous_index > subject->length() || previous_index < 0) { |
| 524 | // Per ECMA-262 15.10.6.2, if the previous index is greater than the |
| 525 | // string length, there is no match. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 526 | return result; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 527 | } else { |
| 528 | #ifdef DEBUG |
| 529 | if (FLAG_trace_regexp_bytecodes) { |
| 530 | String* pattern = regexp->Pattern(); |
| 531 | PrintF("\n\nRegexp match: /%s/\n\n", *(pattern->ToCString())); |
| 532 | PrintF("\n\nSubject string: '%s'\n\n", *(subject->ToCString())); |
| 533 | } |
| 534 | #endif |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 535 | HandleScope scope; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 536 | matches = IrregexpExecOnce(regexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 537 | number_of_capture_registers, |
| 538 | last_match_info, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 539 | subject, |
| 540 | previous_index, |
| 541 | offsets.vector(), |
| 542 | offsets.length()); |
| 543 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 544 | if (matches.is_null()) { |
| 545 | ASSERT(Top::has_pending_exception()); |
| 546 | return matches; |
| 547 | } |
| 548 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 549 | if (matches->IsJSArray()) { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 550 | // Create an array that looks like the static last_match_info array |
| 551 | // that is attached to the global RegExp object. We will be returning |
| 552 | // an array of these. |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 553 | int match_length = kFirstCapture + number_of_capture_registers; |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 554 | Handle<JSArray> latest_match = |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 555 | Factory::NewJSArray(match_length); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 556 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 557 | AssertNoAllocation no_allocation; |
| 558 | FixedArray* match_array = JSArray::cast(*matches)->elements(); |
| 559 | match_array->CopyTo(0, |
| 560 | latest_match->elements(), |
| 561 | 0, |
| 562 | match_length); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 563 | SetElement(result, result_length, latest_match); |
| 564 | result_length++; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 565 | previous_index = GetCapture(match_array, 1); |
| 566 | if (GetCapture(match_array, 0) == previous_index) { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 567 | previous_index++; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 568 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 569 | } else { |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 570 | ASSERT(matches->IsNull()); |
| 571 | return result; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 572 | } |
| 573 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 574 | } |
| 575 | } |
| 576 | |
| 577 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 578 | Handle<Object> RegExpImpl::IrregexpExecOnce(Handle<JSRegExp> jsregexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 579 | int number_of_capture_registers, |
| 580 | Handle<JSArray> last_match_info, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 581 | Handle<String> subject, |
| 582 | int previous_index, |
| 583 | int* offsets_vector, |
| 584 | int offsets_vector_length) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 585 | ASSERT(subject->IsFlat()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 586 | bool rc; |
| 587 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 588 | Handle<String> original_subject = subject; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 589 | Handle<FixedArray> regexp(FixedArray::cast(jsregexp->data())); |
| 590 | if (UseNativeRegexp()) { |
| 591 | #ifdef ARM |
| 592 | UNREACHABLE(); |
| 593 | #else |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 594 | RegExpMacroAssemblerIA32::Result res; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 595 | do { |
| 596 | bool is_ascii = StringShape(*subject).IsAsciiRepresentation(); |
| 597 | if (!EnsureCompiledIrregexp(jsregexp, is_ascii)) { |
| 598 | return Handle<Object>::null(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 599 | } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 600 | Handle<Code> code(RegExpImpl::IrregexpNativeCode(*regexp, is_ascii)); |
| 601 | res = RegExpMacroAssemblerIA32::Match(code, |
| 602 | subject, |
| 603 | offsets_vector, |
| 604 | offsets_vector_length, |
| 605 | previous_index); |
| 606 | // If result is RETRY, the string have changed representation, and we |
| 607 | // must restart from scratch. |
| 608 | } while (res == RegExpMacroAssemblerIA32::RETRY); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 609 | if (res == RegExpMacroAssemblerIA32::EXCEPTION) { |
| 610 | ASSERT(Top::has_pending_exception()); |
| 611 | return Handle<Object>::null(); |
| 612 | } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 613 | ASSERT(res == RegExpMacroAssemblerIA32::SUCCESS |
| 614 | || res == RegExpMacroAssemblerIA32::FAILURE); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 615 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 616 | rc = (res == RegExpMacroAssemblerIA32::SUCCESS); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 617 | #endif |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 618 | } else { |
| 619 | bool is_ascii = StringShape(*subject).IsAsciiRepresentation(); |
| 620 | if (!EnsureCompiledIrregexp(jsregexp, is_ascii)) { |
| 621 | return Handle<Object>::null(); |
| 622 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 623 | for (int i = number_of_capture_registers - 1; i >= 0; i--) { |
| 624 | offsets_vector[i] = -1; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 625 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 626 | Handle<ByteArray> byte_codes(IrregexpByteCode(*regexp, is_ascii)); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 627 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 628 | rc = IrregexpInterpreter::Match(byte_codes, |
| 629 | subject, |
| 630 | offsets_vector, |
| 631 | previous_index); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | if (!rc) { |
| 635 | return Factory::null_value(); |
| 636 | } |
| 637 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 638 | FixedArray* array = last_match_info->elements(); |
| 639 | ASSERT(array->length() >= number_of_capture_registers + kLastMatchOverhead); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 640 | // The captures come in (start, end+1) pairs. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 641 | SetLastCaptureCount(array, number_of_capture_registers); |
| 642 | SetLastSubject(array, *original_subject); |
| 643 | SetLastInput(array, *original_subject); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 644 | for (int i = 0; i < number_of_capture_registers; i+=2) { |
| 645 | SetCapture(array, i, offsets_vector[i]); |
| 646 | SetCapture(array, i + 1, offsets_vector[i + 1]); |
| 647 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 648 | return last_match_info; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | |
| 652 | // ------------------------------------------------------------------- |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 653 | // Implementation of the Irregexp regular expression engine. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 654 | // |
| 655 | // The Irregexp regular expression engine is intended to be a complete |
| 656 | // implementation of ECMAScript regular expressions. It generates either |
| 657 | // bytecodes or native code. |
| 658 | |
| 659 | // The Irregexp regexp engine is structured in three steps. |
| 660 | // 1) The parser generates an abstract syntax tree. See ast.cc. |
| 661 | // 2) From the AST a node network is created. The nodes are all |
| 662 | // subclasses of RegExpNode. The nodes represent states when |
| 663 | // executing a regular expression. Several optimizations are |
| 664 | // performed on the node network. |
| 665 | // 3) From the nodes we generate either byte codes or native code |
| 666 | // that can actually execute the regular expression (perform |
| 667 | // the search). The code generation step is described in more |
| 668 | // detail below. |
| 669 | |
| 670 | // Code generation. |
| 671 | // |
| 672 | // The nodes are divided into four main categories. |
| 673 | // * Choice nodes |
| 674 | // These represent places where the regular expression can |
| 675 | // match in more than one way. For example on entry to an |
| 676 | // alternation (foo|bar) or a repetition (*, +, ? or {}). |
| 677 | // * Action nodes |
| 678 | // These represent places where some action should be |
| 679 | // performed. Examples include recording the current position |
| 680 | // in the input string to a register (in order to implement |
| 681 | // captures) or other actions on register for example in order |
| 682 | // to implement the counters needed for {} repetitions. |
| 683 | // * Matching nodes |
| 684 | // These attempt to match some element part of the input string. |
| 685 | // Examples of elements include character classes, plain strings |
| 686 | // or back references. |
| 687 | // * End nodes |
| 688 | // These are used to implement the actions required on finding |
| 689 | // a successful match or failing to find a match. |
| 690 | // |
| 691 | // The code generated (whether as byte codes or native code) maintains |
| 692 | // some state as it runs. This consists of the following elements: |
| 693 | // |
| 694 | // * The capture registers. Used for string captures. |
| 695 | // * Other registers. Used for counters etc. |
| 696 | // * The current position. |
| 697 | // * The stack of backtracking information. Used when a matching node |
| 698 | // fails to find a match and needs to try an alternative. |
| 699 | // |
| 700 | // Conceptual regular expression execution model: |
| 701 | // |
| 702 | // There is a simple conceptual model of regular expression execution |
| 703 | // which will be presented first. The actual code generated is a more |
| 704 | // efficient simulation of the simple conceptual model: |
| 705 | // |
| 706 | // * Choice nodes are implemented as follows: |
| 707 | // For each choice except the last { |
| 708 | // push current position |
| 709 | // push backtrack code location |
| 710 | // <generate code to test for choice> |
| 711 | // backtrack code location: |
| 712 | // pop current position |
| 713 | // } |
| 714 | // <generate code to test for last choice> |
| 715 | // |
| 716 | // * Actions nodes are generated as follows |
| 717 | // <push affected registers on backtrack stack> |
| 718 | // <generate code to perform action> |
| 719 | // push backtrack code location |
| 720 | // <generate code to test for following nodes> |
| 721 | // backtrack code location: |
| 722 | // <pop affected registers to restore their state> |
| 723 | // <pop backtrack location from stack and go to it> |
| 724 | // |
| 725 | // * Matching nodes are generated as follows: |
| 726 | // if input string matches at current position |
| 727 | // update current position |
| 728 | // <generate code to test for following nodes> |
| 729 | // else |
| 730 | // <pop backtrack location from stack and go to it> |
| 731 | // |
| 732 | // Thus it can be seen that the current position is saved and restored |
| 733 | // by the choice nodes, whereas the registers are saved and restored by |
| 734 | // by the action nodes that manipulate them. |
| 735 | // |
| 736 | // The other interesting aspect of this model is that nodes are generated |
| 737 | // at the point where they are needed by a recursive call to Emit(). If |
| 738 | // the node has already been code generated then the Emit() call will |
| 739 | // generate a jump to the previously generated code instead. In order to |
| 740 | // limit recursion it is possible for the Emit() function to put the node |
| 741 | // on a work list for later generation and instead generate a jump. The |
| 742 | // destination of the jump is resolved later when the code is generated. |
| 743 | // |
| 744 | // Actual regular expression code generation. |
| 745 | // |
| 746 | // Code generation is actually more complicated than the above. In order |
| 747 | // to improve the efficiency of the generated code some optimizations are |
| 748 | // performed |
| 749 | // |
| 750 | // * Choice nodes have 1-character lookahead. |
| 751 | // A choice node looks at the following character and eliminates some of |
| 752 | // the choices immediately based on that character. This is not yet |
| 753 | // implemented. |
| 754 | // * Simple greedy loops store reduced backtracking information. |
| 755 | // A quantifier like /.*foo/m will greedily match the whole input. It will |
| 756 | // then need to backtrack to a point where it can match "foo". The naive |
| 757 | // implementation of this would push each character position onto the |
| 758 | // backtracking stack, then pop them off one by one. This would use space |
| 759 | // proportional to the length of the input string. However since the "." |
| 760 | // can only match in one way and always has a constant length (in this case |
| 761 | // of 1) it suffices to store the current position on the top of the stack |
| 762 | // once. Matching now becomes merely incrementing the current position and |
| 763 | // backtracking becomes decrementing the current position and checking the |
| 764 | // result against the stored current position. This is faster and saves |
| 765 | // space. |
| 766 | // * The current state is virtualized. |
| 767 | // This is used to defer expensive operations until it is clear that they |
| 768 | // are needed and to generate code for a node more than once, allowing |
| 769 | // specialized an efficient versions of the code to be created. This is |
| 770 | // explained in the section below. |
| 771 | // |
| 772 | // Execution state virtualization. |
| 773 | // |
| 774 | // Instead of emitting code, nodes that manipulate the state can record their |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 775 | // manipulation in an object called the Trace. The Trace object can record a |
| 776 | // current position offset, an optional backtrack code location on the top of |
| 777 | // the virtualized backtrack stack and some register changes. When a node is |
| 778 | // to be emitted it can flush the Trace or update it. Flushing the Trace |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 779 | // will emit code to bring the actual state into line with the virtual state. |
| 780 | // Avoiding flushing the state can postpone some work (eg updates of capture |
| 781 | // registers). Postponing work can save time when executing the regular |
| 782 | // expression since it may be found that the work never has to be done as a |
| 783 | // failure to match can occur. In addition it is much faster to jump to a |
| 784 | // known backtrack code location than it is to pop an unknown backtrack |
| 785 | // location from the stack and jump there. |
| 786 | // |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 787 | // The virtual state found in the Trace affects code generation. For example |
| 788 | // the virtual state contains the difference between the actual current |
| 789 | // position and the virtual current position, and matching code needs to use |
| 790 | // this offset to attempt a match in the correct location of the input |
| 791 | // string. Therefore code generated for a non-trivial trace is specialized |
| 792 | // to that trace. The code generator therefore has the ability to generate |
| 793 | // code for each node several times. In order to limit the size of the |
| 794 | // generated code there is an arbitrary limit on how many specialized sets of |
| 795 | // code may be generated for a given node. If the limit is reached, the |
| 796 | // trace is flushed and a generic version of the code for a node is emitted. |
| 797 | // This is subsequently used for that node. The code emitted for non-generic |
| 798 | // trace is not recorded in the node and so it cannot currently be reused in |
| 799 | // the event that code generation is requested for an identical trace. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 800 | |
| 801 | |
| 802 | void RegExpTree::AppendToText(RegExpText* text) { |
| 803 | UNREACHABLE(); |
| 804 | } |
| 805 | |
| 806 | |
| 807 | void RegExpAtom::AppendToText(RegExpText* text) { |
| 808 | text->AddElement(TextElement::Atom(this)); |
| 809 | } |
| 810 | |
| 811 | |
| 812 | void RegExpCharacterClass::AppendToText(RegExpText* text) { |
| 813 | text->AddElement(TextElement::CharClass(this)); |
| 814 | } |
| 815 | |
| 816 | |
| 817 | void RegExpText::AppendToText(RegExpText* text) { |
| 818 | for (int i = 0; i < elements()->length(); i++) |
| 819 | text->AddElement(elements()->at(i)); |
| 820 | } |
| 821 | |
| 822 | |
| 823 | TextElement TextElement::Atom(RegExpAtom* atom) { |
| 824 | TextElement result = TextElement(ATOM); |
| 825 | result.data.u_atom = atom; |
| 826 | return result; |
| 827 | } |
| 828 | |
| 829 | |
| 830 | TextElement TextElement::CharClass( |
| 831 | RegExpCharacterClass* char_class) { |
| 832 | TextElement result = TextElement(CHAR_CLASS); |
| 833 | result.data.u_char_class = char_class; |
| 834 | return result; |
| 835 | } |
| 836 | |
| 837 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 838 | int TextElement::length() { |
| 839 | if (type == ATOM) { |
| 840 | return data.u_atom->length(); |
| 841 | } else { |
| 842 | ASSERT(type == CHAR_CLASS); |
| 843 | return 1; |
| 844 | } |
| 845 | } |
| 846 | |
| 847 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 848 | DispatchTable* ChoiceNode::GetTable(bool ignore_case) { |
| 849 | if (table_ == NULL) { |
| 850 | table_ = new DispatchTable(); |
| 851 | DispatchTableConstructor cons(table_, ignore_case); |
| 852 | cons.BuildTable(this); |
| 853 | } |
| 854 | return table_; |
| 855 | } |
| 856 | |
| 857 | |
| 858 | class RegExpCompiler { |
| 859 | public: |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 860 | RegExpCompiler(int capture_count, bool ignore_case, bool is_ascii); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 861 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 862 | int AllocateRegister() { |
| 863 | if (next_register_ >= RegExpMacroAssembler::kMaxRegister) { |
| 864 | reg_exp_too_big_ = true; |
| 865 | return next_register_; |
| 866 | } |
| 867 | return next_register_++; |
| 868 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 869 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 870 | RegExpEngine::CompilationResult Assemble(RegExpMacroAssembler* assembler, |
| 871 | RegExpNode* start, |
| 872 | int capture_count, |
| 873 | Handle<String> pattern); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 874 | |
| 875 | inline void AddWork(RegExpNode* node) { work_list_->Add(node); } |
| 876 | |
| 877 | static const int kImplementationOffset = 0; |
| 878 | static const int kNumberOfRegistersOffset = 0; |
| 879 | static const int kCodeOffset = 1; |
| 880 | |
| 881 | RegExpMacroAssembler* macro_assembler() { return macro_assembler_; } |
| 882 | EndNode* accept() { return accept_; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 883 | |
| 884 | static const int kMaxRecursion = 100; |
| 885 | inline int recursion_depth() { return recursion_depth_; } |
| 886 | inline void IncrementRecursionDepth() { recursion_depth_++; } |
| 887 | inline void DecrementRecursionDepth() { recursion_depth_--; } |
| 888 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 889 | void SetRegExpTooBig() { reg_exp_too_big_ = true; } |
| 890 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 891 | inline bool ignore_case() { return ignore_case_; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 892 | inline bool ascii() { return ascii_; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 893 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 894 | static const int kNoRegister = -1; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 895 | private: |
| 896 | EndNode* accept_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 897 | int next_register_; |
| 898 | List<RegExpNode*>* work_list_; |
| 899 | int recursion_depth_; |
| 900 | RegExpMacroAssembler* macro_assembler_; |
| 901 | bool ignore_case_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 902 | bool ascii_; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 903 | bool reg_exp_too_big_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 904 | }; |
| 905 | |
| 906 | |
| 907 | class RecursionCheck { |
| 908 | public: |
| 909 | explicit RecursionCheck(RegExpCompiler* compiler) : compiler_(compiler) { |
| 910 | compiler->IncrementRecursionDepth(); |
| 911 | } |
| 912 | ~RecursionCheck() { compiler_->DecrementRecursionDepth(); } |
| 913 | private: |
| 914 | RegExpCompiler* compiler_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 915 | }; |
| 916 | |
| 917 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 918 | static RegExpEngine::CompilationResult IrregexpRegExpTooBig() { |
| 919 | return RegExpEngine::CompilationResult("RegExp too big"); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 923 | // Attempts to compile the regexp using an Irregexp code generator. Returns |
| 924 | // a fixed array or a null handle depending on whether it succeeded. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 925 | RegExpCompiler::RegExpCompiler(int capture_count, bool ignore_case, bool ascii) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 926 | : next_register_(2 * (capture_count + 1)), |
| 927 | work_list_(NULL), |
| 928 | recursion_depth_(0), |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 929 | ignore_case_(ignore_case), |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 930 | ascii_(ascii), |
| 931 | reg_exp_too_big_(false) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 932 | accept_ = new EndNode(EndNode::ACCEPT); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 933 | ASSERT(next_register_ - 1 <= RegExpMacroAssembler::kMaxRegister); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 934 | } |
| 935 | |
| 936 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 937 | RegExpEngine::CompilationResult RegExpCompiler::Assemble( |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 938 | RegExpMacroAssembler* macro_assembler, |
| 939 | RegExpNode* start, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 940 | int capture_count, |
| 941 | Handle<String> pattern) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 942 | #ifdef DEBUG |
| 943 | if (FLAG_trace_regexp_assembler) |
| 944 | macro_assembler_ = new RegExpMacroAssemblerTracer(macro_assembler); |
| 945 | else |
| 946 | #endif |
| 947 | macro_assembler_ = macro_assembler; |
| 948 | List <RegExpNode*> work_list(0); |
| 949 | work_list_ = &work_list; |
| 950 | Label fail; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 951 | macro_assembler_->PushBacktrack(&fail); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 952 | Trace new_trace; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 953 | start->Emit(this, &new_trace); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 954 | macro_assembler_->Bind(&fail); |
| 955 | macro_assembler_->Fail(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 956 | while (!work_list.is_empty()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 957 | work_list.RemoveLast()->Emit(this, &new_trace); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 958 | } |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 959 | if (reg_exp_too_big_) return IrregexpRegExpTooBig(); |
| 960 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 961 | Handle<Object> code = macro_assembler_->GetCode(pattern); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 962 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 963 | work_list_ = NULL; |
| 964 | #ifdef DEBUG |
| 965 | if (FLAG_trace_regexp_assembler) { |
| 966 | delete macro_assembler_; |
| 967 | } |
| 968 | #endif |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 969 | return RegExpEngine::CompilationResult(*code, next_register_); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 970 | } |
| 971 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 972 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 973 | bool Trace::DeferredAction::Mentions(int that) { |
| 974 | if (type() == ActionNode::CLEAR_CAPTURES) { |
| 975 | Interval range = static_cast<DeferredClearCaptures*>(this)->range(); |
| 976 | return range.Contains(that); |
| 977 | } else { |
| 978 | return reg() == that; |
| 979 | } |
| 980 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 981 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 982 | |
| 983 | bool Trace::mentions_reg(int reg) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 984 | for (DeferredAction* action = actions_; |
| 985 | action != NULL; |
| 986 | action = action->next()) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 987 | if (action->Mentions(reg)) |
| 988 | return true; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 989 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 990 | return false; |
| 991 | } |
| 992 | |
| 993 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 994 | bool Trace::GetStoredPosition(int reg, int* cp_offset) { |
| 995 | ASSERT_EQ(0, *cp_offset); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 996 | for (DeferredAction* action = actions_; |
| 997 | action != NULL; |
| 998 | action = action->next()) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 999 | if (action->Mentions(reg)) { |
| 1000 | if (action->type() == ActionNode::STORE_POSITION) { |
| 1001 | *cp_offset = static_cast<DeferredCapture*>(action)->cp_offset(); |
| 1002 | return true; |
| 1003 | } else { |
| 1004 | return false; |
| 1005 | } |
| 1006 | } |
| 1007 | } |
| 1008 | return false; |
| 1009 | } |
| 1010 | |
| 1011 | |
| 1012 | int Trace::FindAffectedRegisters(OutSet* affected_registers) { |
| 1013 | int max_register = RegExpCompiler::kNoRegister; |
| 1014 | for (DeferredAction* action = actions_; |
| 1015 | action != NULL; |
| 1016 | action = action->next()) { |
| 1017 | if (action->type() == ActionNode::CLEAR_CAPTURES) { |
| 1018 | Interval range = static_cast<DeferredClearCaptures*>(action)->range(); |
| 1019 | for (int i = range.from(); i <= range.to(); i++) |
| 1020 | affected_registers->Set(i); |
| 1021 | if (range.to() > max_register) max_register = range.to(); |
| 1022 | } else { |
| 1023 | affected_registers->Set(action->reg()); |
| 1024 | if (action->reg() > max_register) max_register = action->reg(); |
| 1025 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1026 | } |
| 1027 | return max_register; |
| 1028 | } |
| 1029 | |
| 1030 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1031 | void Trace::RestoreAffectedRegisters(RegExpMacroAssembler* assembler, |
| 1032 | int max_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1033 | OutSet& registers_to_pop, |
| 1034 | OutSet& registers_to_clear) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1035 | for (int reg = max_register; reg >= 0; reg--) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1036 | if (registers_to_pop.Get(reg)) assembler->PopRegister(reg); |
| 1037 | else if (registers_to_clear.Get(reg)) { |
| 1038 | int clear_to = reg; |
| 1039 | while (reg > 0 && registers_to_clear.Get(reg - 1)) { |
| 1040 | reg--; |
| 1041 | } |
| 1042 | assembler->ClearRegisters(reg, clear_to); |
| 1043 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1048 | void Trace::PerformDeferredActions(RegExpMacroAssembler* assembler, |
| 1049 | int max_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1050 | OutSet& affected_registers, |
| 1051 | OutSet* registers_to_pop, |
| 1052 | OutSet* registers_to_clear) { |
| 1053 | // The "+1" is to avoid a push_limit of zero if stack_limit_slack() is 1. |
| 1054 | const int push_limit = (assembler->stack_limit_slack() + 1) / 2; |
| 1055 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1056 | for (int reg = 0; reg <= max_register; reg++) { |
| 1057 | if (!affected_registers.Get(reg)) { |
| 1058 | continue; |
| 1059 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1060 | // Count pushes performed to force a stack limit check occasionally. |
| 1061 | int pushes = 0; |
| 1062 | |
| 1063 | // The chronologically first deferred action in the trace |
| 1064 | // is used to infer the action needed to restore a register |
| 1065 | // to its previous state (or not, if it's safe to ignore it). |
| 1066 | enum DeferredActionUndoType { IGNORE, RESTORE, CLEAR }; |
| 1067 | DeferredActionUndoType undo_action = IGNORE; |
| 1068 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1069 | int value = 0; |
| 1070 | bool absolute = false; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1071 | bool clear = false; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1072 | int store_position = -1; |
| 1073 | // This is a little tricky because we are scanning the actions in reverse |
| 1074 | // historical order (newest first). |
| 1075 | for (DeferredAction* action = actions_; |
| 1076 | action != NULL; |
| 1077 | action = action->next()) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1078 | if (action->Mentions(reg)) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1079 | switch (action->type()) { |
| 1080 | case ActionNode::SET_REGISTER: { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1081 | Trace::DeferredSetRegister* psr = |
| 1082 | static_cast<Trace::DeferredSetRegister*>(action); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1083 | if (!absolute) { |
| 1084 | value += psr->value(); |
| 1085 | absolute = true; |
| 1086 | } |
| 1087 | // SET_REGISTER is currently only used for newly introduced loop |
| 1088 | // counters. They can have a significant previous value if they |
| 1089 | // occour in a loop. TODO(lrn): Propagate this information, so |
| 1090 | // we can set undo_action to IGNORE if we know there is no value to |
| 1091 | // restore. |
| 1092 | undo_action = RESTORE; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1093 | ASSERT_EQ(store_position, -1); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1094 | ASSERT(!clear); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1095 | break; |
| 1096 | } |
| 1097 | case ActionNode::INCREMENT_REGISTER: |
| 1098 | if (!absolute) { |
| 1099 | value++; |
| 1100 | } |
| 1101 | ASSERT_EQ(store_position, -1); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1102 | ASSERT(!clear); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1103 | undo_action = RESTORE; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1104 | break; |
| 1105 | case ActionNode::STORE_POSITION: { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1106 | Trace::DeferredCapture* pc = |
| 1107 | static_cast<Trace::DeferredCapture*>(action); |
| 1108 | if (!clear && store_position == -1) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1109 | store_position = pc->cp_offset(); |
| 1110 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1111 | |
| 1112 | // For captures we know that stores and clears alternate. |
| 1113 | // Other register, are never cleared, and if the occur |
| 1114 | // inside a loop, they might be assigned more than once. |
| 1115 | if (reg <= 1) { |
| 1116 | // Registers zero and one, aka "capture zero", is |
| 1117 | // always set correctly if we succeed. There is no |
| 1118 | // need to undo a setting on backtrack, because we |
| 1119 | // will set it again or fail. |
| 1120 | undo_action = IGNORE; |
| 1121 | } else { |
| 1122 | undo_action = pc->is_capture() ? CLEAR : RESTORE; |
| 1123 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1124 | ASSERT(!absolute); |
| 1125 | ASSERT_EQ(value, 0); |
| 1126 | break; |
| 1127 | } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1128 | case ActionNode::CLEAR_CAPTURES: { |
| 1129 | // Since we're scanning in reverse order, if we've already |
| 1130 | // set the position we have to ignore historically earlier |
| 1131 | // clearing operations. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1132 | if (store_position == -1) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1133 | clear = true; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1134 | } |
| 1135 | undo_action = RESTORE; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1136 | ASSERT(!absolute); |
| 1137 | ASSERT_EQ(value, 0); |
| 1138 | break; |
| 1139 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1140 | default: |
| 1141 | UNREACHABLE(); |
| 1142 | break; |
| 1143 | } |
| 1144 | } |
| 1145 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1146 | // Prepare for the undo-action (e.g., push if it's going to be popped). |
| 1147 | if (undo_action == RESTORE) { |
| 1148 | pushes++; |
| 1149 | RegExpMacroAssembler::StackCheckFlag stack_check = |
| 1150 | RegExpMacroAssembler::kNoStackLimitCheck; |
| 1151 | if (pushes == push_limit) { |
| 1152 | stack_check = RegExpMacroAssembler::kCheckStackLimit; |
| 1153 | pushes = 0; |
| 1154 | } |
| 1155 | |
| 1156 | assembler->PushRegister(reg, stack_check); |
| 1157 | registers_to_pop->Set(reg); |
| 1158 | } else if (undo_action == CLEAR) { |
| 1159 | registers_to_clear->Set(reg); |
| 1160 | } |
| 1161 | // Perform the chronologically last action (or accumulated increment) |
| 1162 | // for the register. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1163 | if (store_position != -1) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1164 | assembler->WriteCurrentPositionToRegister(reg, store_position); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1165 | } else if (clear) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1166 | assembler->ClearRegisters(reg, reg); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1167 | } else if (absolute) { |
| 1168 | assembler->SetRegister(reg, value); |
| 1169 | } else if (value != 0) { |
| 1170 | assembler->AdvanceRegister(reg, value); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1171 | } |
| 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1176 | // This is called as we come into a loop choice node and some other tricky |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1177 | // nodes. It normalizes the state of the code generator to ensure we can |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1178 | // generate generic code. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1179 | void Trace::Flush(RegExpCompiler* compiler, RegExpNode* successor) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1180 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1181 | |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1182 | ASSERT(!is_trivial()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1183 | |
| 1184 | if (actions_ == NULL && backtrack() == NULL) { |
| 1185 | // Here we just have some deferred cp advances to fix and we are back to |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1186 | // a normal situation. We may also have to forget some information gained |
| 1187 | // through a quick check that was already performed. |
| 1188 | if (cp_offset_ != 0) assembler->AdvanceCurrentPosition(cp_offset_); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1189 | // Create a new trivial state and generate the node with that. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1190 | Trace new_state; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1191 | successor->Emit(compiler, &new_state); |
| 1192 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1193 | } |
| 1194 | |
| 1195 | // Generate deferred actions here along with code to undo them again. |
| 1196 | OutSet affected_registers; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1197 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1198 | if (backtrack() != NULL) { |
| 1199 | // Here we have a concrete backtrack location. These are set up by choice |
| 1200 | // nodes and so they indicate that we have a deferred save of the current |
| 1201 | // position which we may need to emit here. |
| 1202 | assembler->PushCurrentPosition(); |
| 1203 | } |
| 1204 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1205 | int max_register = FindAffectedRegisters(&affected_registers); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1206 | OutSet registers_to_pop; |
| 1207 | OutSet registers_to_clear; |
| 1208 | PerformDeferredActions(assembler, |
| 1209 | max_register, |
| 1210 | affected_registers, |
| 1211 | ®isters_to_pop, |
| 1212 | ®isters_to_clear); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1213 | if (cp_offset_ != 0) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1214 | assembler->AdvanceCurrentPosition(cp_offset_); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | // Create a new trivial state and generate the node with that. |
| 1218 | Label undo; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1219 | assembler->PushBacktrack(&undo); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1220 | Trace new_state; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1221 | successor->Emit(compiler, &new_state); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1222 | |
| 1223 | // On backtrack we need to restore state. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1224 | assembler->Bind(&undo); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1225 | RestoreAffectedRegisters(assembler, |
| 1226 | max_register, |
| 1227 | registers_to_pop, |
| 1228 | registers_to_clear); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1229 | if (backtrack() == NULL) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1230 | assembler->Backtrack(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1231 | } else { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1232 | assembler->PopCurrentPosition(); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1233 | assembler->GoTo(backtrack()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1234 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1235 | } |
| 1236 | |
| 1237 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1238 | void NegativeSubmatchSuccess::Emit(RegExpCompiler* compiler, Trace* trace) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1239 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1240 | |
| 1241 | // Omit flushing the trace. We discard the entire stack frame anyway. |
| 1242 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1243 | if (!label()->is_bound()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1244 | // We are completely independent of the trace, since we ignore it, |
| 1245 | // so this code can be used as the generic version. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1246 | assembler->Bind(label()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1247 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1248 | |
| 1249 | // Throw away everything on the backtrack stack since the start |
| 1250 | // of the negative submatch and restore the character position. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1251 | assembler->ReadCurrentPositionFromRegister(current_position_register_); |
| 1252 | assembler->ReadStackPointerFromRegister(stack_pointer_register_); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1253 | if (clear_capture_count_ > 0) { |
| 1254 | // Clear any captures that might have been performed during the success |
| 1255 | // of the body of the negative look-ahead. |
| 1256 | int clear_capture_end = clear_capture_start_ + clear_capture_count_ - 1; |
| 1257 | assembler->ClearRegisters(clear_capture_start_, clear_capture_end); |
| 1258 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1259 | // Now that we have unwound the stack we find at the top of the stack the |
| 1260 | // backtrack that the BeginSubmatch node got. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1261 | assembler->Backtrack(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1262 | } |
| 1263 | |
| 1264 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1265 | void EndNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1266 | if (!trace->is_trivial()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1267 | trace->Flush(compiler, this); |
| 1268 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1269 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1270 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1271 | if (!label()->is_bound()) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1272 | assembler->Bind(label()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1273 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1274 | switch (action_) { |
| 1275 | case ACCEPT: |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1276 | assembler->Succeed(); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1277 | return; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1278 | case BACKTRACK: |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1279 | assembler->GoTo(trace->backtrack()); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1280 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1281 | case NEGATIVE_SUBMATCH_SUCCESS: |
| 1282 | // This case is handled in a different virtual method. |
| 1283 | UNREACHABLE(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1284 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1285 | UNIMPLEMENTED(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1286 | } |
| 1287 | |
| 1288 | |
| 1289 | void GuardedAlternative::AddGuard(Guard* guard) { |
| 1290 | if (guards_ == NULL) |
| 1291 | guards_ = new ZoneList<Guard*>(1); |
| 1292 | guards_->Add(guard); |
| 1293 | } |
| 1294 | |
| 1295 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1296 | ActionNode* ActionNode::SetRegister(int reg, |
| 1297 | int val, |
| 1298 | RegExpNode* on_success) { |
| 1299 | ActionNode* result = new ActionNode(SET_REGISTER, on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1300 | result->data_.u_store_register.reg = reg; |
| 1301 | result->data_.u_store_register.value = val; |
| 1302 | return result; |
| 1303 | } |
| 1304 | |
| 1305 | |
| 1306 | ActionNode* ActionNode::IncrementRegister(int reg, RegExpNode* on_success) { |
| 1307 | ActionNode* result = new ActionNode(INCREMENT_REGISTER, on_success); |
| 1308 | result->data_.u_increment_register.reg = reg; |
| 1309 | return result; |
| 1310 | } |
| 1311 | |
| 1312 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1313 | ActionNode* ActionNode::StorePosition(int reg, |
| 1314 | bool is_capture, |
| 1315 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1316 | ActionNode* result = new ActionNode(STORE_POSITION, on_success); |
| 1317 | result->data_.u_position_register.reg = reg; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1318 | result->data_.u_position_register.is_capture = is_capture; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1319 | return result; |
| 1320 | } |
| 1321 | |
| 1322 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1323 | ActionNode* ActionNode::ClearCaptures(Interval range, |
| 1324 | RegExpNode* on_success) { |
| 1325 | ActionNode* result = new ActionNode(CLEAR_CAPTURES, on_success); |
| 1326 | result->data_.u_clear_captures.range_from = range.from(); |
| 1327 | result->data_.u_clear_captures.range_to = range.to(); |
| 1328 | return result; |
| 1329 | } |
| 1330 | |
| 1331 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1332 | ActionNode* ActionNode::BeginSubmatch(int stack_reg, |
| 1333 | int position_reg, |
| 1334 | RegExpNode* on_success) { |
| 1335 | ActionNode* result = new ActionNode(BEGIN_SUBMATCH, on_success); |
| 1336 | result->data_.u_submatch.stack_pointer_register = stack_reg; |
| 1337 | result->data_.u_submatch.current_position_register = position_reg; |
| 1338 | return result; |
| 1339 | } |
| 1340 | |
| 1341 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1342 | ActionNode* ActionNode::PositiveSubmatchSuccess(int stack_reg, |
| 1343 | int position_reg, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1344 | int clear_register_count, |
| 1345 | int clear_register_from, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1346 | RegExpNode* on_success) { |
| 1347 | ActionNode* result = new ActionNode(POSITIVE_SUBMATCH_SUCCESS, on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1348 | result->data_.u_submatch.stack_pointer_register = stack_reg; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1349 | result->data_.u_submatch.current_position_register = position_reg; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1350 | result->data_.u_submatch.clear_register_count = clear_register_count; |
| 1351 | result->data_.u_submatch.clear_register_from = clear_register_from; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1352 | return result; |
| 1353 | } |
| 1354 | |
| 1355 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1356 | ActionNode* ActionNode::EmptyMatchCheck(int start_register, |
| 1357 | int repetition_register, |
| 1358 | int repetition_limit, |
| 1359 | RegExpNode* on_success) { |
| 1360 | ActionNode* result = new ActionNode(EMPTY_MATCH_CHECK, on_success); |
| 1361 | result->data_.u_empty_match_check.start_register = start_register; |
| 1362 | result->data_.u_empty_match_check.repetition_register = repetition_register; |
| 1363 | result->data_.u_empty_match_check.repetition_limit = repetition_limit; |
| 1364 | return result; |
| 1365 | } |
| 1366 | |
| 1367 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1368 | #define DEFINE_ACCEPT(Type) \ |
| 1369 | void Type##Node::Accept(NodeVisitor* visitor) { \ |
| 1370 | visitor->Visit##Type(this); \ |
| 1371 | } |
| 1372 | FOR_EACH_NODE_TYPE(DEFINE_ACCEPT) |
| 1373 | #undef DEFINE_ACCEPT |
| 1374 | |
| 1375 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1376 | void LoopChoiceNode::Accept(NodeVisitor* visitor) { |
| 1377 | visitor->VisitLoopChoice(this); |
| 1378 | } |
| 1379 | |
| 1380 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1381 | // ------------------------------------------------------------------- |
| 1382 | // Emit code. |
| 1383 | |
| 1384 | |
| 1385 | void ChoiceNode::GenerateGuard(RegExpMacroAssembler* macro_assembler, |
| 1386 | Guard* guard, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1387 | Trace* trace) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1388 | switch (guard->op()) { |
| 1389 | case Guard::LT: |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1390 | ASSERT(!trace->mentions_reg(guard->reg())); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1391 | macro_assembler->IfRegisterGE(guard->reg(), |
| 1392 | guard->value(), |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1393 | trace->backtrack()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1394 | break; |
| 1395 | case Guard::GEQ: |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1396 | ASSERT(!trace->mentions_reg(guard->reg())); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1397 | macro_assembler->IfRegisterLT(guard->reg(), |
| 1398 | guard->value(), |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1399 | trace->backtrack()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1400 | break; |
| 1401 | } |
| 1402 | } |
| 1403 | |
| 1404 | |
| 1405 | static unibrow::Mapping<unibrow::Ecma262UnCanonicalize> uncanonicalize; |
| 1406 | static unibrow::Mapping<unibrow::CanonicalizationRange> canonrange; |
| 1407 | |
| 1408 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1409 | // Returns the number of characters in the equivalence class, omitting those |
| 1410 | // that cannot occur in the source string because it is ASCII. |
| 1411 | static int GetCaseIndependentLetters(uc16 character, |
| 1412 | bool ascii_subject, |
| 1413 | unibrow::uchar* letters) { |
| 1414 | int length = uncanonicalize.get(character, '\0', letters); |
| 1415 | // Unibrow returns 0 or 1 for characters where case independependence is |
| 1416 | // trivial. |
| 1417 | if (length == 0) { |
| 1418 | letters[0] = character; |
| 1419 | length = 1; |
| 1420 | } |
| 1421 | if (!ascii_subject || character <= String::kMaxAsciiCharCode) { |
| 1422 | return length; |
| 1423 | } |
| 1424 | // The standard requires that non-ASCII characters cannot have ASCII |
| 1425 | // character codes in their equivalence class. |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
| 1429 | |
| 1430 | static inline bool EmitSimpleCharacter(RegExpCompiler* compiler, |
| 1431 | uc16 c, |
| 1432 | Label* on_failure, |
| 1433 | int cp_offset, |
| 1434 | bool check, |
| 1435 | bool preloaded) { |
| 1436 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1437 | bool bound_checked = false; |
| 1438 | if (!preloaded) { |
| 1439 | assembler->LoadCurrentCharacter( |
| 1440 | cp_offset, |
| 1441 | on_failure, |
| 1442 | check); |
| 1443 | bound_checked = true; |
| 1444 | } |
| 1445 | assembler->CheckNotCharacter(c, on_failure); |
| 1446 | return bound_checked; |
| 1447 | } |
| 1448 | |
| 1449 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1450 | // Only emits non-letters (things that don't have case). Only used for case |
| 1451 | // independent matches. |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1452 | static inline bool EmitAtomNonLetter(RegExpCompiler* compiler, |
| 1453 | uc16 c, |
| 1454 | Label* on_failure, |
| 1455 | int cp_offset, |
| 1456 | bool check, |
| 1457 | bool preloaded) { |
| 1458 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 1459 | bool ascii = compiler->ascii(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1460 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1461 | int length = GetCaseIndependentLetters(c, ascii, chars); |
| 1462 | if (length < 1) { |
| 1463 | // This can't match. Must be an ASCII subject and a non-ASCII character. |
| 1464 | // We do not need to do anything since the ASCII pass already handled this. |
| 1465 | return false; // Bounds not checked. |
| 1466 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1467 | bool checked = false; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1468 | // We handle the length > 1 case in a later pass. |
| 1469 | if (length == 1) { |
| 1470 | if (ascii && c > String::kMaxAsciiCharCodeU) { |
| 1471 | // Can't match - see above. |
| 1472 | return false; // Bounds not checked. |
| 1473 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1474 | if (!preloaded) { |
| 1475 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check); |
| 1476 | checked = check; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1477 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1478 | macro_assembler->CheckNotCharacter(c, on_failure); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1479 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1480 | return checked; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1481 | } |
| 1482 | |
| 1483 | |
| 1484 | static bool ShortCutEmitCharacterPair(RegExpMacroAssembler* macro_assembler, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1485 | bool ascii, |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1486 | uc16 c1, |
| 1487 | uc16 c2, |
| 1488 | Label* on_failure) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1489 | uc16 char_mask; |
| 1490 | if (ascii) { |
| 1491 | char_mask = String::kMaxAsciiCharCode; |
| 1492 | } else { |
| 1493 | char_mask = String::kMaxUC16CharCode; |
| 1494 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1495 | uc16 exor = c1 ^ c2; |
| 1496 | // Check whether exor has only one bit set. |
| 1497 | if (((exor - 1) & exor) == 0) { |
| 1498 | // If c1 and c2 differ only by one bit. |
| 1499 | // Ecma262UnCanonicalize always gives the highest number last. |
| 1500 | ASSERT(c2 > c1); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1501 | uc16 mask = char_mask ^ exor; |
| 1502 | macro_assembler->CheckNotCharacterAfterAnd(c1, mask, on_failure); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1503 | return true; |
| 1504 | } |
| 1505 | ASSERT(c2 > c1); |
| 1506 | uc16 diff = c2 - c1; |
| 1507 | if (((diff - 1) & diff) == 0 && c1 >= diff) { |
| 1508 | // If the characters differ by 2^n but don't differ by one bit then |
| 1509 | // subtract the difference from the found character, then do the or |
| 1510 | // trick. We avoid the theoretical case where negative numbers are |
| 1511 | // involved in order to simplify code generation. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1512 | uc16 mask = char_mask ^ diff; |
| 1513 | macro_assembler->CheckNotCharacterAfterMinusAnd(c1 - diff, |
| 1514 | diff, |
| 1515 | mask, |
| 1516 | on_failure); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1517 | return true; |
| 1518 | } |
| 1519 | return false; |
| 1520 | } |
| 1521 | |
| 1522 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1523 | typedef bool EmitCharacterFunction(RegExpCompiler* compiler, |
| 1524 | uc16 c, |
| 1525 | Label* on_failure, |
| 1526 | int cp_offset, |
| 1527 | bool check, |
| 1528 | bool preloaded); |
| 1529 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1530 | // Only emits letters (things that have case). Only used for case independent |
| 1531 | // matches. |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1532 | static inline bool EmitAtomLetter(RegExpCompiler* compiler, |
| 1533 | uc16 c, |
| 1534 | Label* on_failure, |
| 1535 | int cp_offset, |
| 1536 | bool check, |
| 1537 | bool preloaded) { |
| 1538 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 1539 | bool ascii = compiler->ascii(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1540 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1541 | int length = GetCaseIndependentLetters(c, ascii, chars); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1542 | if (length <= 1) return false; |
| 1543 | // We may not need to check against the end of the input string |
| 1544 | // if this character lies before a character that matched. |
| 1545 | if (!preloaded) { |
| 1546 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1547 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1548 | Label ok; |
| 1549 | ASSERT(unibrow::Ecma262UnCanonicalize::kMaxWidth == 4); |
| 1550 | switch (length) { |
| 1551 | case 2: { |
| 1552 | if (ShortCutEmitCharacterPair(macro_assembler, |
| 1553 | ascii, |
| 1554 | chars[0], |
| 1555 | chars[1], |
| 1556 | on_failure)) { |
| 1557 | } else { |
| 1558 | macro_assembler->CheckCharacter(chars[0], &ok); |
| 1559 | macro_assembler->CheckNotCharacter(chars[1], on_failure); |
| 1560 | macro_assembler->Bind(&ok); |
| 1561 | } |
| 1562 | break; |
| 1563 | } |
| 1564 | case 4: |
| 1565 | macro_assembler->CheckCharacter(chars[3], &ok); |
| 1566 | // Fall through! |
| 1567 | case 3: |
| 1568 | macro_assembler->CheckCharacter(chars[0], &ok); |
| 1569 | macro_assembler->CheckCharacter(chars[1], &ok); |
| 1570 | macro_assembler->CheckNotCharacter(chars[2], on_failure); |
| 1571 | macro_assembler->Bind(&ok); |
| 1572 | break; |
| 1573 | default: |
| 1574 | UNREACHABLE(); |
| 1575 | break; |
| 1576 | } |
| 1577 | return true; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1578 | } |
| 1579 | |
| 1580 | |
| 1581 | static void EmitCharClass(RegExpMacroAssembler* macro_assembler, |
| 1582 | RegExpCharacterClass* cc, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1583 | bool ascii, |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1584 | Label* on_failure, |
| 1585 | int cp_offset, |
| 1586 | bool check_offset, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1587 | bool preloaded) { |
| 1588 | if (cc->is_standard() && |
| 1589 | macro_assembler->CheckSpecialCharacterClass(cc->standard_type(), |
| 1590 | cp_offset, |
| 1591 | check_offset, |
| 1592 | on_failure)) { |
| 1593 | return; |
| 1594 | } |
| 1595 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1596 | ZoneList<CharacterRange>* ranges = cc->ranges(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1597 | int max_char; |
| 1598 | if (ascii) { |
| 1599 | max_char = String::kMaxAsciiCharCode; |
| 1600 | } else { |
| 1601 | max_char = String::kMaxUC16CharCode; |
| 1602 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1603 | |
| 1604 | Label success; |
| 1605 | |
| 1606 | Label* char_is_in_class = |
| 1607 | cc->is_negated() ? on_failure : &success; |
| 1608 | |
| 1609 | int range_count = ranges->length(); |
| 1610 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1611 | int last_valid_range = range_count - 1; |
| 1612 | while (last_valid_range >= 0) { |
| 1613 | CharacterRange& range = ranges->at(last_valid_range); |
| 1614 | if (range.from() <= max_char) { |
| 1615 | break; |
| 1616 | } |
| 1617 | last_valid_range--; |
| 1618 | } |
| 1619 | |
| 1620 | if (last_valid_range < 0) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1621 | if (!cc->is_negated()) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1622 | // TODO(plesner): We can remove this when the node level does our |
| 1623 | // ASCII optimizations for us. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1624 | macro_assembler->GoTo(on_failure); |
| 1625 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1626 | if (check_offset) { |
| 1627 | macro_assembler->CheckPosition(cp_offset, on_failure); |
| 1628 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1629 | return; |
| 1630 | } |
| 1631 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1632 | if (last_valid_range == 0 && |
| 1633 | !cc->is_negated() && |
| 1634 | ranges->at(0).IsEverything(max_char)) { |
| 1635 | // This is a common case hit by non-anchored expressions. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1636 | if (check_offset) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1637 | macro_assembler->CheckPosition(cp_offset, on_failure); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1638 | } |
| 1639 | return; |
| 1640 | } |
| 1641 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1642 | if (!preloaded) { |
| 1643 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check_offset); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1644 | } |
| 1645 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1646 | for (int i = 0; i < last_valid_range; i++) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1647 | CharacterRange& range = ranges->at(i); |
| 1648 | Label next_range; |
| 1649 | uc16 from = range.from(); |
| 1650 | uc16 to = range.to(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1651 | if (from > max_char) { |
| 1652 | continue; |
| 1653 | } |
| 1654 | if (to > max_char) to = max_char; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1655 | if (to == from) { |
| 1656 | macro_assembler->CheckCharacter(to, char_is_in_class); |
| 1657 | } else { |
| 1658 | if (from != 0) { |
| 1659 | macro_assembler->CheckCharacterLT(from, &next_range); |
| 1660 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1661 | if (to != max_char) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1662 | macro_assembler->CheckCharacterLT(to + 1, char_is_in_class); |
| 1663 | } else { |
| 1664 | macro_assembler->GoTo(char_is_in_class); |
| 1665 | } |
| 1666 | } |
| 1667 | macro_assembler->Bind(&next_range); |
| 1668 | } |
| 1669 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1670 | CharacterRange& range = ranges->at(last_valid_range); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1671 | uc16 from = range.from(); |
| 1672 | uc16 to = range.to(); |
| 1673 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1674 | if (to > max_char) to = max_char; |
| 1675 | ASSERT(to >= from); |
| 1676 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1677 | if (to == from) { |
| 1678 | if (cc->is_negated()) { |
| 1679 | macro_assembler->CheckCharacter(to, on_failure); |
| 1680 | } else { |
| 1681 | macro_assembler->CheckNotCharacter(to, on_failure); |
| 1682 | } |
| 1683 | } else { |
| 1684 | if (from != 0) { |
| 1685 | if (cc->is_negated()) { |
| 1686 | macro_assembler->CheckCharacterLT(from, &success); |
| 1687 | } else { |
| 1688 | macro_assembler->CheckCharacterLT(from, on_failure); |
| 1689 | } |
| 1690 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1691 | if (to != String::kMaxUC16CharCode) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1692 | if (cc->is_negated()) { |
| 1693 | macro_assembler->CheckCharacterLT(to + 1, on_failure); |
| 1694 | } else { |
| 1695 | macro_assembler->CheckCharacterGT(to, on_failure); |
| 1696 | } |
| 1697 | } else { |
| 1698 | if (cc->is_negated()) { |
| 1699 | macro_assembler->GoTo(on_failure); |
| 1700 | } |
| 1701 | } |
| 1702 | } |
| 1703 | macro_assembler->Bind(&success); |
| 1704 | } |
| 1705 | |
| 1706 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1707 | RegExpNode::~RegExpNode() { |
| 1708 | } |
| 1709 | |
| 1710 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1711 | RegExpNode::LimitResult RegExpNode::LimitVersions(RegExpCompiler* compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1712 | Trace* trace) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1713 | // If we are generating a greedy loop then don't stop and don't reuse code. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1714 | if (trace->stop_node() != NULL) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1715 | return CONTINUE; |
| 1716 | } |
| 1717 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1718 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1719 | if (trace->is_trivial()) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1720 | if (label_.is_bound()) { |
| 1721 | // We are being asked to generate a generic version, but that's already |
| 1722 | // been done so just go to it. |
| 1723 | macro_assembler->GoTo(&label_); |
| 1724 | return DONE; |
| 1725 | } |
| 1726 | if (compiler->recursion_depth() >= RegExpCompiler::kMaxRecursion) { |
| 1727 | // To avoid too deep recursion we push the node to the work queue and just |
| 1728 | // generate a goto here. |
| 1729 | compiler->AddWork(this); |
| 1730 | macro_assembler->GoTo(&label_); |
| 1731 | return DONE; |
| 1732 | } |
| 1733 | // Generate generic version of the node and bind the label for later use. |
| 1734 | macro_assembler->Bind(&label_); |
| 1735 | return CONTINUE; |
| 1736 | } |
| 1737 | |
| 1738 | // We are being asked to make a non-generic version. Keep track of how many |
| 1739 | // non-generic versions we generate so as not to overdo it. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1740 | trace_count_++; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1741 | if (FLAG_regexp_optimization && |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1742 | trace_count_ < kMaxCopiesCodeGenerated && |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1743 | compiler->recursion_depth() <= RegExpCompiler::kMaxRecursion) { |
| 1744 | return CONTINUE; |
| 1745 | } |
| 1746 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1747 | // If we get here code has been generated for this node too many times or |
| 1748 | // recursion is too deep. Time to switch to a generic version. The code for |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1749 | // generic versions above can handle deep recursion properly. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1750 | trace->Flush(compiler, this); |
| 1751 | return DONE; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1752 | } |
| 1753 | |
| 1754 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1755 | int ActionNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1756 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return 0; |
| 1757 | if (type_ == POSITIVE_SUBMATCH_SUCCESS) return 0; // Rewinds input! |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1758 | return on_success()->EatsAtLeast(still_to_find, recursion_depth + 1); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1759 | } |
| 1760 | |
| 1761 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1762 | int AssertionNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
| 1763 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return 0; |
| 1764 | return on_success()->EatsAtLeast(still_to_find, recursion_depth + 1); |
| 1765 | } |
| 1766 | |
| 1767 | |
| 1768 | int BackReferenceNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
| 1769 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return 0; |
| 1770 | return on_success()->EatsAtLeast(still_to_find, recursion_depth + 1); |
| 1771 | } |
| 1772 | |
| 1773 | |
| 1774 | int TextNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1775 | int answer = Length(); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1776 | if (answer >= still_to_find) return answer; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1777 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return answer; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1778 | return answer + on_success()->EatsAtLeast(still_to_find - answer, |
| 1779 | recursion_depth + 1); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1780 | } |
| 1781 | |
| 1782 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1783 | int NegativeLookaheadChoiceNode:: EatsAtLeast(int still_to_find, |
| 1784 | int recursion_depth) { |
| 1785 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return 0; |
| 1786 | // Alternative 0 is the negative lookahead, alternative 1 is what comes |
| 1787 | // afterwards. |
| 1788 | RegExpNode* node = alternatives_->at(1).node(); |
| 1789 | return node->EatsAtLeast(still_to_find, recursion_depth + 1); |
| 1790 | } |
| 1791 | |
| 1792 | |
| 1793 | void NegativeLookaheadChoiceNode::GetQuickCheckDetails( |
| 1794 | QuickCheckDetails* details, |
| 1795 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1796 | int filled_in, |
| 1797 | bool not_at_start) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1798 | // Alternative 0 is the negative lookahead, alternative 1 is what comes |
| 1799 | // afterwards. |
| 1800 | RegExpNode* node = alternatives_->at(1).node(); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1801 | return node->GetQuickCheckDetails(details, compiler, filled_in, not_at_start); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1802 | } |
| 1803 | |
| 1804 | |
| 1805 | int ChoiceNode::EatsAtLeastHelper(int still_to_find, |
| 1806 | int recursion_depth, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1807 | RegExpNode* ignore_this_node) { |
| 1808 | if (recursion_depth > RegExpCompiler::kMaxRecursion) return 0; |
| 1809 | int min = 100; |
| 1810 | int choice_count = alternatives_->length(); |
| 1811 | for (int i = 0; i < choice_count; i++) { |
| 1812 | RegExpNode* node = alternatives_->at(i).node(); |
| 1813 | if (node == ignore_this_node) continue; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1814 | int node_eats_at_least = node->EatsAtLeast(still_to_find, |
| 1815 | recursion_depth + 1); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1816 | if (node_eats_at_least < min) min = node_eats_at_least; |
| 1817 | } |
| 1818 | return min; |
| 1819 | } |
| 1820 | |
| 1821 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1822 | int LoopChoiceNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
| 1823 | return EatsAtLeastHelper(still_to_find, recursion_depth, loop_node_); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1824 | } |
| 1825 | |
| 1826 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1827 | int ChoiceNode::EatsAtLeast(int still_to_find, int recursion_depth) { |
| 1828 | return EatsAtLeastHelper(still_to_find, recursion_depth, NULL); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1829 | } |
| 1830 | |
| 1831 | |
| 1832 | // Takes the left-most 1-bit and smears it out, setting all bits to its right. |
| 1833 | static inline uint32_t SmearBitsRight(uint32_t v) { |
| 1834 | v |= v >> 1; |
| 1835 | v |= v >> 2; |
| 1836 | v |= v >> 4; |
| 1837 | v |= v >> 8; |
| 1838 | v |= v >> 16; |
| 1839 | return v; |
| 1840 | } |
| 1841 | |
| 1842 | |
| 1843 | bool QuickCheckDetails::Rationalize(bool asc) { |
| 1844 | bool found_useful_op = false; |
| 1845 | uint32_t char_mask; |
| 1846 | if (asc) { |
| 1847 | char_mask = String::kMaxAsciiCharCode; |
| 1848 | } else { |
| 1849 | char_mask = String::kMaxUC16CharCode; |
| 1850 | } |
| 1851 | mask_ = 0; |
| 1852 | value_ = 0; |
| 1853 | int char_shift = 0; |
| 1854 | for (int i = 0; i < characters_; i++) { |
| 1855 | Position* pos = &positions_[i]; |
| 1856 | if ((pos->mask & String::kMaxAsciiCharCode) != 0) { |
| 1857 | found_useful_op = true; |
| 1858 | } |
| 1859 | mask_ |= (pos->mask & char_mask) << char_shift; |
| 1860 | value_ |= (pos->value & char_mask) << char_shift; |
| 1861 | char_shift += asc ? 8 : 16; |
| 1862 | } |
| 1863 | return found_useful_op; |
| 1864 | } |
| 1865 | |
| 1866 | |
| 1867 | bool RegExpNode::EmitQuickCheck(RegExpCompiler* compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1868 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1869 | bool preload_has_checked_bounds, |
| 1870 | Label* on_possible_success, |
| 1871 | QuickCheckDetails* details, |
| 1872 | bool fall_through_on_failure) { |
| 1873 | if (details->characters() == 0) return false; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1874 | GetQuickCheckDetails(details, compiler, 0, trace->at_start() == Trace::FALSE); |
| 1875 | if (details->cannot_match()) return false; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1876 | if (!details->Rationalize(compiler->ascii())) return false; |
| 1877 | uint32_t mask = details->mask(); |
| 1878 | uint32_t value = details->value(); |
| 1879 | |
| 1880 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1881 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1882 | if (trace->characters_preloaded() != details->characters()) { |
| 1883 | assembler->LoadCurrentCharacter(trace->cp_offset(), |
| 1884 | trace->backtrack(), |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1885 | !preload_has_checked_bounds, |
| 1886 | details->characters()); |
| 1887 | } |
| 1888 | |
| 1889 | |
| 1890 | bool need_mask = true; |
| 1891 | |
| 1892 | if (details->characters() == 1) { |
| 1893 | // If number of characters preloaded is 1 then we used a byte or 16 bit |
| 1894 | // load so the value is already masked down. |
| 1895 | uint32_t char_mask; |
| 1896 | if (compiler->ascii()) { |
| 1897 | char_mask = String::kMaxAsciiCharCode; |
| 1898 | } else { |
| 1899 | char_mask = String::kMaxUC16CharCode; |
| 1900 | } |
| 1901 | if ((mask & char_mask) == char_mask) need_mask = false; |
| 1902 | mask &= char_mask; |
| 1903 | } else { |
| 1904 | // For 2-character preloads in ASCII mode we also use a 16 bit load with |
| 1905 | // zero extend. |
| 1906 | if (details->characters() == 2 && compiler->ascii()) { |
| 1907 | if ((mask & 0xffff) == 0xffff) need_mask = false; |
| 1908 | } else { |
| 1909 | if (mask == 0xffffffff) need_mask = false; |
| 1910 | } |
| 1911 | } |
| 1912 | |
| 1913 | if (fall_through_on_failure) { |
| 1914 | if (need_mask) { |
| 1915 | assembler->CheckCharacterAfterAnd(value, mask, on_possible_success); |
| 1916 | } else { |
| 1917 | assembler->CheckCharacter(value, on_possible_success); |
| 1918 | } |
| 1919 | } else { |
| 1920 | if (need_mask) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1921 | assembler->CheckNotCharacterAfterAnd(value, mask, trace->backtrack()); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1922 | } else { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1923 | assembler->CheckNotCharacter(value, trace->backtrack()); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1924 | } |
| 1925 | } |
| 1926 | return true; |
| 1927 | } |
| 1928 | |
| 1929 | |
| 1930 | // Here is the meat of GetQuickCheckDetails (see also the comment on the |
| 1931 | // super-class in the .h file). |
| 1932 | // |
| 1933 | // We iterate along the text object, building up for each character a |
| 1934 | // mask and value that can be used to test for a quick failure to match. |
| 1935 | // The masks and values for the positions will be combined into a single |
| 1936 | // machine word for the current character width in order to be used in |
| 1937 | // generating a quick check. |
| 1938 | void TextNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 1939 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1940 | int characters_filled_in, |
| 1941 | bool not_at_start) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1942 | ASSERT(characters_filled_in < details->characters()); |
| 1943 | int characters = details->characters(); |
| 1944 | int char_mask; |
| 1945 | int char_shift; |
| 1946 | if (compiler->ascii()) { |
| 1947 | char_mask = String::kMaxAsciiCharCode; |
| 1948 | char_shift = 8; |
| 1949 | } else { |
| 1950 | char_mask = String::kMaxUC16CharCode; |
| 1951 | char_shift = 16; |
| 1952 | } |
| 1953 | for (int k = 0; k < elms_->length(); k++) { |
| 1954 | TextElement elm = elms_->at(k); |
| 1955 | if (elm.type == TextElement::ATOM) { |
| 1956 | Vector<const uc16> quarks = elm.data.u_atom->data(); |
| 1957 | for (int i = 0; i < characters && i < quarks.length(); i++) { |
| 1958 | QuickCheckDetails::Position* pos = |
| 1959 | details->positions(characters_filled_in); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 1960 | uc16 c = quarks[i]; |
| 1961 | if (c > char_mask) { |
| 1962 | // If we expect a non-ASCII character from an ASCII string, |
| 1963 | // there is no way we can match. Not even case independent |
| 1964 | // matching can turn an ASCII character into non-ASCII or |
| 1965 | // vice versa. |
| 1966 | details->set_cannot_match(); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1967 | pos->determines_perfectly = false; |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 1968 | return; |
| 1969 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1970 | if (compiler->ignore_case()) { |
| 1971 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1972 | int length = GetCaseIndependentLetters(c, compiler->ascii(), chars); |
| 1973 | ASSERT(length != 0); // Can only happen if c > char_mask (see above). |
| 1974 | if (length == 1) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1975 | // This letter has no case equivalents, so it's nice and simple |
| 1976 | // and the mask-compare will determine definitely whether we have |
| 1977 | // a match at this character position. |
| 1978 | pos->mask = char_mask; |
| 1979 | pos->value = c; |
| 1980 | pos->determines_perfectly = true; |
| 1981 | } else { |
| 1982 | uint32_t common_bits = char_mask; |
| 1983 | uint32_t bits = chars[0]; |
| 1984 | for (int j = 1; j < length; j++) { |
| 1985 | uint32_t differing_bits = ((chars[j] & common_bits) ^ bits); |
| 1986 | common_bits ^= differing_bits; |
| 1987 | bits &= common_bits; |
| 1988 | } |
| 1989 | // If length is 2 and common bits has only one zero in it then |
| 1990 | // our mask and compare instruction will determine definitely |
| 1991 | // whether we have a match at this character position. Otherwise |
| 1992 | // it can only be an approximate check. |
| 1993 | uint32_t one_zero = (common_bits | ~char_mask); |
| 1994 | if (length == 2 && ((~one_zero) & ((~one_zero) - 1)) == 0) { |
| 1995 | pos->determines_perfectly = true; |
| 1996 | } |
| 1997 | pos->mask = common_bits; |
| 1998 | pos->value = bits; |
| 1999 | } |
| 2000 | } else { |
| 2001 | // Don't ignore case. Nice simple case where the mask-compare will |
| 2002 | // determine definitely whether we have a match at this character |
| 2003 | // position. |
| 2004 | pos->mask = char_mask; |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2005 | pos->value = c; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2006 | pos->determines_perfectly = true; |
| 2007 | } |
| 2008 | characters_filled_in++; |
| 2009 | ASSERT(characters_filled_in <= details->characters()); |
| 2010 | if (characters_filled_in == details->characters()) { |
| 2011 | return; |
| 2012 | } |
| 2013 | } |
| 2014 | } else { |
| 2015 | QuickCheckDetails::Position* pos = |
| 2016 | details->positions(characters_filled_in); |
| 2017 | RegExpCharacterClass* tree = elm.data.u_char_class; |
| 2018 | ZoneList<CharacterRange>* ranges = tree->ranges(); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2019 | if (tree->is_negated()) { |
| 2020 | // A quick check uses multi-character mask and compare. There is no |
| 2021 | // useful way to incorporate a negative char class into this scheme |
| 2022 | // so we just conservatively create a mask and value that will always |
| 2023 | // succeed. |
| 2024 | pos->mask = 0; |
| 2025 | pos->value = 0; |
| 2026 | } else { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2027 | int first_range = 0; |
| 2028 | while (ranges->at(first_range).from() > char_mask) { |
| 2029 | first_range++; |
| 2030 | if (first_range == ranges->length()) { |
| 2031 | details->set_cannot_match(); |
| 2032 | pos->determines_perfectly = false; |
| 2033 | return; |
| 2034 | } |
| 2035 | } |
| 2036 | CharacterRange range = ranges->at(first_range); |
| 2037 | uc16 from = range.from(); |
| 2038 | uc16 to = range.to(); |
| 2039 | if (to > char_mask) { |
| 2040 | to = char_mask; |
| 2041 | } |
| 2042 | uint32_t differing_bits = (from ^ to); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2043 | // A mask and compare is only perfect if the differing bits form a |
| 2044 | // number like 00011111 with one single block of trailing 1s. |
| 2045 | if ((differing_bits & (differing_bits + 1)) == 0) { |
| 2046 | pos->determines_perfectly = true; |
| 2047 | } |
| 2048 | uint32_t common_bits = ~SmearBitsRight(differing_bits); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2049 | uint32_t bits = (from & common_bits); |
| 2050 | for (int i = first_range + 1; i < ranges->length(); i++) { |
| 2051 | CharacterRange range = ranges->at(i); |
| 2052 | uc16 from = range.from(); |
| 2053 | uc16 to = range.to(); |
| 2054 | if (from > char_mask) continue; |
| 2055 | if (to > char_mask) to = char_mask; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2056 | // Here we are combining more ranges into the mask and compare |
| 2057 | // value. With each new range the mask becomes more sparse and |
| 2058 | // so the chances of a false positive rise. A character class |
| 2059 | // with multiple ranges is assumed never to be equivalent to a |
| 2060 | // mask and compare operation. |
| 2061 | pos->determines_perfectly = false; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2062 | uint32_t new_common_bits = (from ^ to); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2063 | new_common_bits = ~SmearBitsRight(new_common_bits); |
| 2064 | common_bits &= new_common_bits; |
| 2065 | bits &= new_common_bits; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2066 | uint32_t differing_bits = (from & common_bits) ^ bits; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2067 | common_bits ^= differing_bits; |
| 2068 | bits &= common_bits; |
| 2069 | } |
| 2070 | pos->mask = common_bits; |
| 2071 | pos->value = bits; |
| 2072 | } |
| 2073 | characters_filled_in++; |
| 2074 | ASSERT(characters_filled_in <= details->characters()); |
| 2075 | if (characters_filled_in == details->characters()) { |
| 2076 | return; |
| 2077 | } |
| 2078 | } |
| 2079 | } |
| 2080 | ASSERT(characters_filled_in != details->characters()); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2081 | on_success()-> GetQuickCheckDetails(details, |
| 2082 | compiler, |
| 2083 | characters_filled_in, |
| 2084 | true); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2085 | } |
| 2086 | |
| 2087 | |
| 2088 | void QuickCheckDetails::Clear() { |
| 2089 | for (int i = 0; i < characters_; i++) { |
| 2090 | positions_[i].mask = 0; |
| 2091 | positions_[i].value = 0; |
| 2092 | positions_[i].determines_perfectly = false; |
| 2093 | } |
| 2094 | characters_ = 0; |
| 2095 | } |
| 2096 | |
| 2097 | |
| 2098 | void QuickCheckDetails::Advance(int by, bool ascii) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2099 | ASSERT(by >= 0); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2100 | if (by >= characters_) { |
| 2101 | Clear(); |
| 2102 | return; |
| 2103 | } |
| 2104 | for (int i = 0; i < characters_ - by; i++) { |
| 2105 | positions_[i] = positions_[by + i]; |
| 2106 | } |
| 2107 | for (int i = characters_ - by; i < characters_; i++) { |
| 2108 | positions_[i].mask = 0; |
| 2109 | positions_[i].value = 0; |
| 2110 | positions_[i].determines_perfectly = false; |
| 2111 | } |
| 2112 | characters_ -= by; |
| 2113 | // We could change mask_ and value_ here but we would never advance unless |
| 2114 | // they had already been used in a check and they won't be used again because |
| 2115 | // it would gain us nothing. So there's no point. |
| 2116 | } |
| 2117 | |
| 2118 | |
| 2119 | void QuickCheckDetails::Merge(QuickCheckDetails* other, int from_index) { |
| 2120 | ASSERT(characters_ == other->characters_); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2121 | if (other->cannot_match_) { |
| 2122 | return; |
| 2123 | } |
| 2124 | if (cannot_match_) { |
| 2125 | *this = *other; |
| 2126 | return; |
| 2127 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2128 | for (int i = from_index; i < characters_; i++) { |
| 2129 | QuickCheckDetails::Position* pos = positions(i); |
| 2130 | QuickCheckDetails::Position* other_pos = other->positions(i); |
| 2131 | if (pos->mask != other_pos->mask || |
| 2132 | pos->value != other_pos->value || |
| 2133 | !other_pos->determines_perfectly) { |
| 2134 | // Our mask-compare operation will be approximate unless we have the |
| 2135 | // exact same operation on both sides of the alternation. |
| 2136 | pos->determines_perfectly = false; |
| 2137 | } |
| 2138 | pos->mask &= other_pos->mask; |
| 2139 | pos->value &= pos->mask; |
| 2140 | other_pos->value &= pos->mask; |
| 2141 | uc16 differing_bits = (pos->value ^ other_pos->value); |
| 2142 | pos->mask &= ~differing_bits; |
| 2143 | pos->value &= pos->mask; |
| 2144 | } |
| 2145 | } |
| 2146 | |
| 2147 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2148 | class VisitMarker { |
| 2149 | public: |
| 2150 | explicit VisitMarker(NodeInfo* info) : info_(info) { |
| 2151 | ASSERT(!info->visited); |
| 2152 | info->visited = true; |
| 2153 | } |
| 2154 | ~VisitMarker() { |
| 2155 | info_->visited = false; |
| 2156 | } |
| 2157 | private: |
| 2158 | NodeInfo* info_; |
| 2159 | }; |
| 2160 | |
| 2161 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2162 | void LoopChoiceNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2163 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2164 | int characters_filled_in, |
| 2165 | bool not_at_start) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2166 | if (body_can_be_zero_length_ || info()->visited) return; |
| 2167 | VisitMarker marker(info()); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2168 | return ChoiceNode::GetQuickCheckDetails(details, |
| 2169 | compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2170 | characters_filled_in, |
| 2171 | not_at_start); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2172 | } |
| 2173 | |
| 2174 | |
| 2175 | void ChoiceNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2176 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2177 | int characters_filled_in, |
| 2178 | bool not_at_start) { |
| 2179 | not_at_start = (not_at_start || not_at_start_); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2180 | int choice_count = alternatives_->length(); |
| 2181 | ASSERT(choice_count > 0); |
| 2182 | alternatives_->at(0).node()->GetQuickCheckDetails(details, |
| 2183 | compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2184 | characters_filled_in, |
| 2185 | not_at_start); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2186 | for (int i = 1; i < choice_count; i++) { |
| 2187 | QuickCheckDetails new_details(details->characters()); |
| 2188 | RegExpNode* node = alternatives_->at(i).node(); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2189 | node->GetQuickCheckDetails(&new_details, compiler, |
| 2190 | characters_filled_in, |
| 2191 | not_at_start); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2192 | // Here we merge the quick match details of the two branches. |
| 2193 | details->Merge(&new_details, characters_filled_in); |
| 2194 | } |
| 2195 | } |
| 2196 | |
| 2197 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2198 | // Check for [0-9A-Z_a-z]. |
| 2199 | static void EmitWordCheck(RegExpMacroAssembler* assembler, |
| 2200 | Label* word, |
| 2201 | Label* non_word, |
| 2202 | bool fall_through_on_word) { |
| 2203 | assembler->CheckCharacterGT('z', non_word); |
| 2204 | assembler->CheckCharacterLT('0', non_word); |
| 2205 | assembler->CheckCharacterGT('a' - 1, word); |
| 2206 | assembler->CheckCharacterLT('9' + 1, word); |
| 2207 | assembler->CheckCharacterLT('A', non_word); |
| 2208 | assembler->CheckCharacterLT('Z' + 1, word); |
| 2209 | if (fall_through_on_word) { |
| 2210 | assembler->CheckNotCharacter('_', non_word); |
| 2211 | } else { |
| 2212 | assembler->CheckCharacter('_', word); |
| 2213 | } |
| 2214 | } |
| 2215 | |
| 2216 | |
| 2217 | // Emit the code to check for a ^ in multiline mode (1-character lookbehind |
| 2218 | // that matches newline or the start of input). |
| 2219 | static void EmitHat(RegExpCompiler* compiler, |
| 2220 | RegExpNode* on_success, |
| 2221 | Trace* trace) { |
| 2222 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 2223 | // We will be loading the previous character into the current character |
| 2224 | // register. |
| 2225 | Trace new_trace(*trace); |
| 2226 | new_trace.InvalidateCurrentCharacter(); |
| 2227 | |
| 2228 | Label ok; |
| 2229 | if (new_trace.cp_offset() == 0) { |
| 2230 | // The start of input counts as a newline in this context, so skip to |
| 2231 | // ok if we are at the start. |
| 2232 | assembler->CheckAtStart(&ok); |
| 2233 | } |
| 2234 | // We already checked that we are not at the start of input so it must be |
| 2235 | // OK to load the previous character. |
| 2236 | assembler->LoadCurrentCharacter(new_trace.cp_offset() -1, |
| 2237 | new_trace.backtrack(), |
| 2238 | false); |
| 2239 | // Newline means \n, \r, 0x2028 or 0x2029. |
| 2240 | if (!compiler->ascii()) { |
| 2241 | assembler->CheckCharacterAfterAnd(0x2028, 0xfffe, &ok); |
| 2242 | } |
| 2243 | assembler->CheckCharacter('\n', &ok); |
| 2244 | assembler->CheckNotCharacter('\r', new_trace.backtrack()); |
| 2245 | assembler->Bind(&ok); |
| 2246 | on_success->Emit(compiler, &new_trace); |
| 2247 | } |
| 2248 | |
| 2249 | |
| 2250 | // Emit the code to handle \b and \B (word-boundary or non-word-boundary). |
| 2251 | static void EmitBoundaryCheck(AssertionNode::AssertionNodeType type, |
| 2252 | RegExpCompiler* compiler, |
| 2253 | RegExpNode* on_success, |
| 2254 | Trace* trace) { |
| 2255 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 2256 | Label before_non_word; |
| 2257 | Label before_word; |
| 2258 | if (trace->characters_preloaded() != 1) { |
| 2259 | assembler->LoadCurrentCharacter(trace->cp_offset(), &before_non_word); |
| 2260 | } |
| 2261 | // Fall through on non-word. |
| 2262 | EmitWordCheck(assembler, &before_word, &before_non_word, false); |
| 2263 | |
| 2264 | // We will be loading the previous character into the current character |
| 2265 | // register. |
| 2266 | Trace new_trace(*trace); |
| 2267 | new_trace.InvalidateCurrentCharacter(); |
| 2268 | |
| 2269 | Label ok; |
| 2270 | Label* boundary; |
| 2271 | Label* not_boundary; |
| 2272 | if (type == AssertionNode::AT_BOUNDARY) { |
| 2273 | boundary = &ok; |
| 2274 | not_boundary = new_trace.backtrack(); |
| 2275 | } else { |
| 2276 | not_boundary = &ok; |
| 2277 | boundary = new_trace.backtrack(); |
| 2278 | } |
| 2279 | |
| 2280 | // Next character is not a word character. |
| 2281 | assembler->Bind(&before_non_word); |
| 2282 | if (new_trace.cp_offset() == 0) { |
| 2283 | // The start of input counts as a non-word character, so the question is |
| 2284 | // decided if we are at the start. |
| 2285 | assembler->CheckAtStart(not_boundary); |
| 2286 | } |
| 2287 | // We already checked that we are not at the start of input so it must be |
| 2288 | // OK to load the previous character. |
| 2289 | assembler->LoadCurrentCharacter(new_trace.cp_offset() - 1, |
| 2290 | &ok, // Unused dummy label in this call. |
| 2291 | false); |
| 2292 | // Fall through on non-word. |
| 2293 | EmitWordCheck(assembler, boundary, not_boundary, false); |
| 2294 | assembler->GoTo(not_boundary); |
| 2295 | |
| 2296 | // Next character is a word character. |
| 2297 | assembler->Bind(&before_word); |
| 2298 | if (new_trace.cp_offset() == 0) { |
| 2299 | // The start of input counts as a non-word character, so the question is |
| 2300 | // decided if we are at the start. |
| 2301 | assembler->CheckAtStart(boundary); |
| 2302 | } |
| 2303 | // We already checked that we are not at the start of input so it must be |
| 2304 | // OK to load the previous character. |
| 2305 | assembler->LoadCurrentCharacter(new_trace.cp_offset() - 1, |
| 2306 | &ok, // Unused dummy label in this call. |
| 2307 | false); |
| 2308 | bool fall_through_on_word = (type == AssertionNode::AT_NON_BOUNDARY); |
| 2309 | EmitWordCheck(assembler, not_boundary, boundary, fall_through_on_word); |
| 2310 | |
| 2311 | assembler->Bind(&ok); |
| 2312 | |
| 2313 | on_success->Emit(compiler, &new_trace); |
| 2314 | } |
| 2315 | |
| 2316 | |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2317 | void AssertionNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2318 | RegExpCompiler* compiler, |
| 2319 | int filled_in, |
| 2320 | bool not_at_start) { |
| 2321 | if (type_ == AT_START && not_at_start) { |
| 2322 | details->set_cannot_match(); |
| 2323 | return; |
| 2324 | } |
| 2325 | return on_success()->GetQuickCheckDetails(details, |
| 2326 | compiler, |
| 2327 | filled_in, |
| 2328 | not_at_start); |
| 2329 | } |
| 2330 | |
| 2331 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2332 | void AssertionNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 2333 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 2334 | switch (type_) { |
| 2335 | case AT_END: { |
| 2336 | Label ok; |
| 2337 | assembler->CheckPosition(trace->cp_offset(), &ok); |
| 2338 | assembler->GoTo(trace->backtrack()); |
| 2339 | assembler->Bind(&ok); |
| 2340 | break; |
| 2341 | } |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2342 | case AT_START: { |
| 2343 | if (trace->at_start() == Trace::FALSE) { |
| 2344 | assembler->GoTo(trace->backtrack()); |
| 2345 | return; |
| 2346 | } |
| 2347 | if (trace->at_start() == Trace::UNKNOWN) { |
| 2348 | assembler->CheckNotAtStart(trace->backtrack()); |
| 2349 | Trace at_start_trace = *trace; |
| 2350 | at_start_trace.set_at_start(true); |
| 2351 | on_success()->Emit(compiler, &at_start_trace); |
| 2352 | return; |
| 2353 | } |
| 2354 | } |
| 2355 | break; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2356 | case AFTER_NEWLINE: |
| 2357 | EmitHat(compiler, on_success(), trace); |
| 2358 | return; |
| 2359 | case AT_NON_BOUNDARY: |
| 2360 | case AT_BOUNDARY: |
| 2361 | EmitBoundaryCheck(type_, compiler, on_success(), trace); |
| 2362 | return; |
| 2363 | } |
| 2364 | on_success()->Emit(compiler, trace); |
| 2365 | } |
| 2366 | |
| 2367 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2368 | static bool DeterminedAlready(QuickCheckDetails* quick_check, int offset) { |
| 2369 | if (quick_check == NULL) return false; |
| 2370 | if (offset >= quick_check->characters()) return false; |
| 2371 | return quick_check->positions(offset)->determines_perfectly; |
| 2372 | } |
| 2373 | |
| 2374 | |
| 2375 | static void UpdateBoundsCheck(int index, int* checked_up_to) { |
| 2376 | if (index > *checked_up_to) { |
| 2377 | *checked_up_to = index; |
| 2378 | } |
| 2379 | } |
| 2380 | |
| 2381 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2382 | // We call this repeatedly to generate code for each pass over the text node. |
| 2383 | // The passes are in increasing order of difficulty because we hope one |
| 2384 | // of the first passes will fail in which case we are saved the work of the |
| 2385 | // later passes. for example for the case independent regexp /%[asdfghjkl]a/ |
| 2386 | // we will check the '%' in the first pass, the case independent 'a' in the |
| 2387 | // second pass and the character class in the last pass. |
| 2388 | // |
| 2389 | // The passes are done from right to left, so for example to test for /bar/ |
| 2390 | // we will first test for an 'r' with offset 2, then an 'a' with offset 1 |
| 2391 | // and then a 'b' with offset 0. This means we can avoid the end-of-input |
| 2392 | // bounds check most of the time. In the example we only need to check for |
| 2393 | // end-of-input when loading the putative 'r'. |
| 2394 | // |
| 2395 | // A slight complication involves the fact that the first character may already |
| 2396 | // be fetched into a register by the previous node. In this case we want to |
| 2397 | // do the test for that character first. We do this in separate passes. The |
| 2398 | // 'preloaded' argument indicates that we are doing such a 'pass'. If such a |
| 2399 | // pass has been performed then subsequent passes will have true in |
| 2400 | // first_element_checked to indicate that that character does not need to be |
| 2401 | // checked again. |
| 2402 | // |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2403 | // In addition to all this we are passed a Trace, which can |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2404 | // contain an AlternativeGeneration object. In this AlternativeGeneration |
| 2405 | // object we can see details of any quick check that was already passed in |
| 2406 | // order to get to the code we are now generating. The quick check can involve |
| 2407 | // loading characters, which means we do not need to recheck the bounds |
| 2408 | // up to the limit the quick check already checked. In addition the quick |
| 2409 | // check can have involved a mask and compare operation which may simplify |
| 2410 | // or obviate the need for further checks at some character positions. |
| 2411 | void TextNode::TextEmitPass(RegExpCompiler* compiler, |
| 2412 | TextEmitPassType pass, |
| 2413 | bool preloaded, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2414 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2415 | bool first_element_checked, |
| 2416 | int* checked_up_to) { |
| 2417 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 2418 | bool ascii = compiler->ascii(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2419 | Label* backtrack = trace->backtrack(); |
| 2420 | QuickCheckDetails* quick_check = trace->quick_check_performed(); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2421 | int element_count = elms_->length(); |
| 2422 | for (int i = preloaded ? 0 : element_count - 1; i >= 0; i--) { |
| 2423 | TextElement elm = elms_->at(i); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2424 | int cp_offset = trace->cp_offset() + elm.cp_offset; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2425 | if (elm.type == TextElement::ATOM) { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2426 | Vector<const uc16> quarks = elm.data.u_atom->data(); |
| 2427 | for (int j = preloaded ? 0 : quarks.length() - 1; j >= 0; j--) { |
| 2428 | if (first_element_checked && i == 0 && j == 0) continue; |
| 2429 | if (DeterminedAlready(quick_check, elm.cp_offset + j)) continue; |
| 2430 | EmitCharacterFunction* emit_function = NULL; |
| 2431 | switch (pass) { |
| 2432 | case NON_ASCII_MATCH: |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2433 | ASSERT(ascii); |
| 2434 | if (quarks[j] > String::kMaxAsciiCharCode) { |
| 2435 | assembler->GoTo(backtrack); |
| 2436 | return; |
| 2437 | } |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2438 | break; |
| 2439 | case NON_LETTER_CHARACTER_MATCH: |
| 2440 | emit_function = &EmitAtomNonLetter; |
| 2441 | break; |
| 2442 | case SIMPLE_CHARACTER_MATCH: |
| 2443 | emit_function = &EmitSimpleCharacter; |
| 2444 | break; |
| 2445 | case CASE_CHARACTER_MATCH: |
| 2446 | emit_function = &EmitAtomLetter; |
| 2447 | break; |
| 2448 | default: |
| 2449 | break; |
| 2450 | } |
| 2451 | if (emit_function != NULL) { |
| 2452 | bool bound_checked = emit_function(compiler, |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2453 | quarks[j], |
| 2454 | backtrack, |
| 2455 | cp_offset + j, |
| 2456 | *checked_up_to < cp_offset + j, |
| 2457 | preloaded); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2458 | if (bound_checked) UpdateBoundsCheck(cp_offset + j, checked_up_to); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2459 | } |
| 2460 | } |
| 2461 | } else { |
| 2462 | ASSERT_EQ(elm.type, TextElement::CHAR_CLASS); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2463 | if (pass == CHARACTER_CLASS_MATCH) { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2464 | if (first_element_checked && i == 0) continue; |
| 2465 | if (DeterminedAlready(quick_check, elm.cp_offset)) continue; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2466 | RegExpCharacterClass* cc = elm.data.u_char_class; |
| 2467 | EmitCharClass(assembler, |
| 2468 | cc, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2469 | ascii, |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2470 | backtrack, |
| 2471 | cp_offset, |
| 2472 | *checked_up_to < cp_offset, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2473 | preloaded); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2474 | UpdateBoundsCheck(cp_offset, checked_up_to); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2475 | } |
| 2476 | } |
| 2477 | } |
| 2478 | } |
| 2479 | |
| 2480 | |
| 2481 | int TextNode::Length() { |
| 2482 | TextElement elm = elms_->last(); |
| 2483 | ASSERT(elm.cp_offset >= 0); |
| 2484 | if (elm.type == TextElement::ATOM) { |
| 2485 | return elm.cp_offset + elm.data.u_atom->data().length(); |
| 2486 | } else { |
| 2487 | return elm.cp_offset + 1; |
| 2488 | } |
| 2489 | } |
| 2490 | |
| 2491 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2492 | bool TextNode::SkipPass(int int_pass, bool ignore_case) { |
| 2493 | TextEmitPassType pass = static_cast<TextEmitPassType>(int_pass); |
| 2494 | if (ignore_case) { |
| 2495 | return pass == SIMPLE_CHARACTER_MATCH; |
| 2496 | } else { |
| 2497 | return pass == NON_LETTER_CHARACTER_MATCH || pass == CASE_CHARACTER_MATCH; |
| 2498 | } |
| 2499 | } |
| 2500 | |
| 2501 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2502 | // This generates the code to match a text node. A text node can contain |
| 2503 | // straight character sequences (possibly to be matched in a case-independent |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2504 | // way) and character classes. For efficiency we do not do this in a single |
| 2505 | // pass from left to right. Instead we pass over the text node several times, |
| 2506 | // emitting code for some character positions every time. See the comment on |
| 2507 | // TextEmitPass for details. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2508 | void TextNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2509 | LimitResult limit_result = LimitVersions(compiler, trace); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2510 | if (limit_result == DONE) return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2511 | ASSERT(limit_result == CONTINUE); |
| 2512 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2513 | if (trace->cp_offset() + Length() > RegExpMacroAssembler::kMaxCPOffset) { |
| 2514 | compiler->SetRegExpTooBig(); |
| 2515 | return; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2516 | } |
| 2517 | |
| 2518 | if (compiler->ascii()) { |
| 2519 | int dummy = 0; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2520 | TextEmitPass(compiler, NON_ASCII_MATCH, false, trace, false, &dummy); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2521 | } |
| 2522 | |
| 2523 | bool first_elt_done = false; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2524 | int bound_checked_to = trace->cp_offset() - 1; |
| 2525 | bound_checked_to += trace->bound_checked_up_to(); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2526 | |
| 2527 | // If a character is preloaded into the current character register then |
| 2528 | // check that now. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2529 | if (trace->characters_preloaded() == 1) { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2530 | for (int pass = kFirstRealPass; pass <= kLastPass; pass++) { |
| 2531 | if (!SkipPass(pass, compiler->ignore_case())) { |
| 2532 | TextEmitPass(compiler, |
| 2533 | static_cast<TextEmitPassType>(pass), |
| 2534 | true, |
| 2535 | trace, |
| 2536 | false, |
| 2537 | &bound_checked_to); |
| 2538 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2539 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2540 | first_elt_done = true; |
| 2541 | } |
| 2542 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2543 | for (int pass = kFirstRealPass; pass <= kLastPass; pass++) { |
| 2544 | if (!SkipPass(pass, compiler->ignore_case())) { |
| 2545 | TextEmitPass(compiler, |
| 2546 | static_cast<TextEmitPassType>(pass), |
| 2547 | false, |
| 2548 | trace, |
| 2549 | first_elt_done, |
| 2550 | &bound_checked_to); |
| 2551 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2552 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2553 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2554 | Trace successor_trace(*trace); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2555 | successor_trace.set_at_start(false); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2556 | successor_trace.AdvanceCurrentPositionInTrace(Length(), compiler); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2557 | RecursionCheck rc(compiler); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2558 | on_success()->Emit(compiler, &successor_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2559 | } |
| 2560 | |
| 2561 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2562 | void Trace::InvalidateCurrentCharacter() { |
| 2563 | characters_preloaded_ = 0; |
| 2564 | } |
| 2565 | |
| 2566 | |
| 2567 | void Trace::AdvanceCurrentPositionInTrace(int by, RegExpCompiler* compiler) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2568 | ASSERT(by > 0); |
| 2569 | // We don't have an instruction for shifting the current character register |
| 2570 | // down or for using a shifted value for anything so lets just forget that |
| 2571 | // we preloaded any characters into it. |
| 2572 | characters_preloaded_ = 0; |
| 2573 | // Adjust the offsets of the quick check performed information. This |
| 2574 | // information is used to find out what we already determined about the |
| 2575 | // characters by means of mask and compare. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2576 | quick_check_performed_.Advance(by, compiler->ascii()); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2577 | cp_offset_ += by; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2578 | if (cp_offset_ > RegExpMacroAssembler::kMaxCPOffset) { |
| 2579 | compiler->SetRegExpTooBig(); |
| 2580 | cp_offset_ = 0; |
| 2581 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2582 | bound_checked_up_to_ = Max(0, bound_checked_up_to_ - by); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2583 | } |
| 2584 | |
| 2585 | |
| 2586 | void TextNode::MakeCaseIndependent() { |
| 2587 | int element_count = elms_->length(); |
| 2588 | for (int i = 0; i < element_count; i++) { |
| 2589 | TextElement elm = elms_->at(i); |
| 2590 | if (elm.type == TextElement::CHAR_CLASS) { |
| 2591 | RegExpCharacterClass* cc = elm.data.u_char_class; |
| 2592 | ZoneList<CharacterRange>* ranges = cc->ranges(); |
| 2593 | int range_count = ranges->length(); |
| 2594 | for (int i = 0; i < range_count; i++) { |
| 2595 | ranges->at(i).AddCaseEquivalents(ranges); |
| 2596 | } |
| 2597 | } |
| 2598 | } |
| 2599 | } |
| 2600 | |
| 2601 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2602 | int TextNode::GreedyLoopTextLength() { |
| 2603 | TextElement elm = elms_->at(elms_->length() - 1); |
| 2604 | if (elm.type == TextElement::CHAR_CLASS) { |
| 2605 | return elm.cp_offset + 1; |
| 2606 | } else { |
| 2607 | return elm.cp_offset + elm.data.u_atom->data().length(); |
| 2608 | } |
| 2609 | } |
| 2610 | |
| 2611 | |
| 2612 | // Finds the fixed match length of a sequence of nodes that goes from |
| 2613 | // this alternative and back to this choice node. If there are variable |
| 2614 | // length nodes or other complications in the way then return a sentinel |
| 2615 | // value indicating that a greedy loop cannot be constructed. |
| 2616 | int ChoiceNode::GreedyLoopTextLength(GuardedAlternative* alternative) { |
| 2617 | int length = 0; |
| 2618 | RegExpNode* node = alternative->node(); |
| 2619 | // Later we will generate code for all these text nodes using recursion |
| 2620 | // so we have to limit the max number. |
| 2621 | int recursion_depth = 0; |
| 2622 | while (node != this) { |
| 2623 | if (recursion_depth++ > RegExpCompiler::kMaxRecursion) { |
| 2624 | return kNodeIsTooComplexForGreedyLoops; |
| 2625 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2626 | int node_length = node->GreedyLoopTextLength(); |
| 2627 | if (node_length == kNodeIsTooComplexForGreedyLoops) { |
| 2628 | return kNodeIsTooComplexForGreedyLoops; |
| 2629 | } |
| 2630 | length += node_length; |
| 2631 | SeqRegExpNode* seq_node = static_cast<SeqRegExpNode*>(node); |
| 2632 | node = seq_node->on_success(); |
| 2633 | } |
| 2634 | return length; |
| 2635 | } |
| 2636 | |
| 2637 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2638 | void LoopChoiceNode::AddLoopAlternative(GuardedAlternative alt) { |
| 2639 | ASSERT_EQ(loop_node_, NULL); |
| 2640 | AddAlternative(alt); |
| 2641 | loop_node_ = alt.node(); |
| 2642 | } |
| 2643 | |
| 2644 | |
| 2645 | void LoopChoiceNode::AddContinueAlternative(GuardedAlternative alt) { |
| 2646 | ASSERT_EQ(continue_node_, NULL); |
| 2647 | AddAlternative(alt); |
| 2648 | continue_node_ = alt.node(); |
| 2649 | } |
| 2650 | |
| 2651 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2652 | void LoopChoiceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2653 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2654 | if (trace->stop_node() == this) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2655 | int text_length = GreedyLoopTextLength(&(alternatives_->at(0))); |
| 2656 | ASSERT(text_length != kNodeIsTooComplexForGreedyLoops); |
| 2657 | // Update the counter-based backtracking info on the stack. This is an |
| 2658 | // optimization for greedy loops (see below). |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2659 | ASSERT(trace->cp_offset() == text_length); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2660 | macro_assembler->AdvanceCurrentPosition(text_length); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2661 | macro_assembler->GoTo(trace->loop_label()); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2662 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2663 | } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2664 | ASSERT(trace->stop_node() == NULL); |
| 2665 | if (!trace->is_trivial()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2666 | trace->Flush(compiler, this); |
| 2667 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2668 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2669 | ChoiceNode::Emit(compiler, trace); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2670 | } |
| 2671 | |
| 2672 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2673 | int ChoiceNode::CalculatePreloadCharacters(RegExpCompiler* compiler) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2674 | int preload_characters = EatsAtLeast(4, 0); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2675 | #ifdef CAN_READ_UNALIGNED |
| 2676 | bool ascii = compiler->ascii(); |
| 2677 | if (ascii) { |
| 2678 | if (preload_characters > 4) preload_characters = 4; |
| 2679 | // We can't preload 3 characters because there is no machine instruction |
| 2680 | // to do that. We can't just load 4 because we could be reading |
| 2681 | // beyond the end of the string, which could cause a memory fault. |
| 2682 | if (preload_characters == 3) preload_characters = 2; |
| 2683 | } else { |
| 2684 | if (preload_characters > 2) preload_characters = 2; |
| 2685 | } |
| 2686 | #else |
| 2687 | if (preload_characters > 1) preload_characters = 1; |
| 2688 | #endif |
| 2689 | return preload_characters; |
| 2690 | } |
| 2691 | |
| 2692 | |
| 2693 | // This class is used when generating the alternatives in a choice node. It |
| 2694 | // records the way the alternative is being code generated. |
| 2695 | class AlternativeGeneration: public Malloced { |
| 2696 | public: |
| 2697 | AlternativeGeneration() |
| 2698 | : possible_success(), |
| 2699 | expects_preload(false), |
| 2700 | after(), |
| 2701 | quick_check_details() { } |
| 2702 | Label possible_success; |
| 2703 | bool expects_preload; |
| 2704 | Label after; |
| 2705 | QuickCheckDetails quick_check_details; |
| 2706 | }; |
| 2707 | |
| 2708 | |
| 2709 | // Creates a list of AlternativeGenerations. If the list has a reasonable |
| 2710 | // size then it is on the stack, otherwise the excess is on the heap. |
| 2711 | class AlternativeGenerationList { |
| 2712 | public: |
| 2713 | explicit AlternativeGenerationList(int count) |
| 2714 | : alt_gens_(count) { |
| 2715 | for (int i = 0; i < count && i < kAFew; i++) { |
| 2716 | alt_gens_.Add(a_few_alt_gens_ + i); |
| 2717 | } |
| 2718 | for (int i = kAFew; i < count; i++) { |
| 2719 | alt_gens_.Add(new AlternativeGeneration()); |
| 2720 | } |
| 2721 | } |
| 2722 | ~AlternativeGenerationList() { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2723 | for (int i = kAFew; i < alt_gens_.length(); i++) { |
| 2724 | delete alt_gens_[i]; |
| 2725 | alt_gens_[i] = NULL; |
| 2726 | } |
| 2727 | } |
| 2728 | |
| 2729 | AlternativeGeneration* at(int i) { |
| 2730 | return alt_gens_[i]; |
| 2731 | } |
| 2732 | private: |
| 2733 | static const int kAFew = 10; |
| 2734 | ZoneList<AlternativeGeneration*> alt_gens_; |
| 2735 | AlternativeGeneration a_few_alt_gens_[kAFew]; |
| 2736 | }; |
| 2737 | |
| 2738 | |
| 2739 | /* Code generation for choice nodes. |
| 2740 | * |
| 2741 | * We generate quick checks that do a mask and compare to eliminate a |
| 2742 | * choice. If the quick check succeeds then it jumps to the continuation to |
| 2743 | * do slow checks and check subsequent nodes. If it fails (the common case) |
| 2744 | * it falls through to the next choice. |
| 2745 | * |
| 2746 | * Here is the desired flow graph. Nodes directly below each other imply |
| 2747 | * fallthrough. Alternatives 1 and 2 have quick checks. Alternative |
| 2748 | * 3 doesn't have a quick check so we have to call the slow check. |
| 2749 | * Nodes are marked Qn for quick checks and Sn for slow checks. The entire |
| 2750 | * regexp continuation is generated directly after the Sn node, up to the |
| 2751 | * next GoTo if we decide to reuse some already generated code. Some |
| 2752 | * nodes expect preload_characters to be preloaded into the current |
| 2753 | * character register. R nodes do this preloading. Vertices are marked |
| 2754 | * F for failures and S for success (possible success in the case of quick |
| 2755 | * nodes). L, V, < and > are used as arrow heads. |
| 2756 | * |
| 2757 | * ----------> R |
| 2758 | * | |
| 2759 | * V |
| 2760 | * Q1 -----> S1 |
| 2761 | * | S / |
| 2762 | * F| / |
| 2763 | * | F/ |
| 2764 | * | / |
| 2765 | * | R |
| 2766 | * | / |
| 2767 | * V L |
| 2768 | * Q2 -----> S2 |
| 2769 | * | S / |
| 2770 | * F| / |
| 2771 | * | F/ |
| 2772 | * | / |
| 2773 | * | R |
| 2774 | * | / |
| 2775 | * V L |
| 2776 | * S3 |
| 2777 | * | |
| 2778 | * F| |
| 2779 | * | |
| 2780 | * R |
| 2781 | * | |
| 2782 | * backtrack V |
| 2783 | * <----------Q4 |
| 2784 | * \ F | |
| 2785 | * \ |S |
| 2786 | * \ F V |
| 2787 | * \-----S4 |
| 2788 | * |
| 2789 | * For greedy loops we reverse our expectation and expect to match rather |
| 2790 | * than fail. Therefore we want the loop code to look like this (U is the |
| 2791 | * unwind code that steps back in the greedy loop). The following alternatives |
| 2792 | * look the same as above. |
| 2793 | * _____ |
| 2794 | * / \ |
| 2795 | * V | |
| 2796 | * ----------> S1 | |
| 2797 | * /| | |
| 2798 | * / |S | |
| 2799 | * F/ \_____/ |
| 2800 | * / |
| 2801 | * |<----------- |
| 2802 | * | \ |
| 2803 | * V \ |
| 2804 | * Q2 ---> S2 \ |
| 2805 | * | S / | |
| 2806 | * F| / | |
| 2807 | * | F/ | |
| 2808 | * | / | |
| 2809 | * | R | |
| 2810 | * | / | |
| 2811 | * F VL | |
| 2812 | * <------U | |
| 2813 | * back |S | |
| 2814 | * \______________/ |
| 2815 | */ |
| 2816 | |
| 2817 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2818 | void ChoiceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2819 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 2820 | int choice_count = alternatives_->length(); |
| 2821 | #ifdef DEBUG |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2822 | for (int i = 0; i < choice_count - 1; i++) { |
| 2823 | GuardedAlternative alternative = alternatives_->at(i); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2824 | ZoneList<Guard*>* guards = alternative.guards(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2825 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
| 2826 | for (int j = 0; j < guard_count; j++) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2827 | ASSERT(!trace->mentions_reg(guards->at(j)->reg())); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2828 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2829 | } |
| 2830 | #endif |
| 2831 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2832 | LimitResult limit_result = LimitVersions(compiler, trace); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2833 | if (limit_result == DONE) return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2834 | ASSERT(limit_result == CONTINUE); |
| 2835 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2836 | int new_flush_budget = trace->flush_budget() / choice_count; |
| 2837 | if (trace->flush_budget() == 0 && trace->actions() != NULL) { |
| 2838 | trace->Flush(compiler, this); |
| 2839 | return; |
| 2840 | } |
| 2841 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2842 | RecursionCheck rc(compiler); |
| 2843 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2844 | Trace* current_trace = trace; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2845 | |
| 2846 | int text_length = GreedyLoopTextLength(&(alternatives_->at(0))); |
| 2847 | bool greedy_loop = false; |
| 2848 | Label greedy_loop_label; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2849 | Trace counter_backtrack_trace; |
| 2850 | counter_backtrack_trace.set_backtrack(&greedy_loop_label); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2851 | if (not_at_start()) counter_backtrack_trace.set_at_start(false); |
| 2852 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2853 | if (choice_count > 1 && text_length != kNodeIsTooComplexForGreedyLoops) { |
| 2854 | // Here we have special handling for greedy loops containing only text nodes |
| 2855 | // and other simple nodes. These are handled by pushing the current |
| 2856 | // position on the stack and then incrementing the current position each |
| 2857 | // time around the switch. On backtrack we decrement the current position |
| 2858 | // and check it against the pushed value. This avoids pushing backtrack |
| 2859 | // information for each iteration of the loop, which could take up a lot of |
| 2860 | // space. |
| 2861 | greedy_loop = true; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2862 | ASSERT(trace->stop_node() == NULL); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2863 | macro_assembler->PushCurrentPosition(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2864 | current_trace = &counter_backtrack_trace; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2865 | Label greedy_match_failed; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2866 | Trace greedy_match_trace; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2867 | if (not_at_start()) greedy_match_trace.set_at_start(false); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2868 | greedy_match_trace.set_backtrack(&greedy_match_failed); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2869 | Label loop_label; |
| 2870 | macro_assembler->Bind(&loop_label); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2871 | greedy_match_trace.set_stop_node(this); |
| 2872 | greedy_match_trace.set_loop_label(&loop_label); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2873 | alternatives_->at(0).node()->Emit(compiler, &greedy_match_trace); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2874 | macro_assembler->Bind(&greedy_match_failed); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2875 | } |
| 2876 | |
| 2877 | Label second_choice; // For use in greedy matches. |
| 2878 | macro_assembler->Bind(&second_choice); |
| 2879 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2880 | int first_normal_choice = greedy_loop ? 1 : 0; |
| 2881 | |
| 2882 | int preload_characters = CalculatePreloadCharacters(compiler); |
| 2883 | bool preload_is_current = |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2884 | (current_trace->characters_preloaded() == preload_characters); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2885 | bool preload_has_checked_bounds = preload_is_current; |
| 2886 | |
| 2887 | AlternativeGenerationList alt_gens(choice_count); |
| 2888 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2889 | // For now we just call all choices one after the other. The idea ultimately |
| 2890 | // is to use the Dispatch table to try only the relevant ones. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2891 | for (int i = first_normal_choice; i < choice_count; i++) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2892 | GuardedAlternative alternative = alternatives_->at(i); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2893 | AlternativeGeneration* alt_gen = alt_gens.at(i); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2894 | alt_gen->quick_check_details.set_characters(preload_characters); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2895 | ZoneList<Guard*>* guards = alternative.guards(); |
| 2896 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2897 | Trace new_trace(*current_trace); |
| 2898 | new_trace.set_characters_preloaded(preload_is_current ? |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2899 | preload_characters : |
| 2900 | 0); |
| 2901 | if (preload_has_checked_bounds) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2902 | new_trace.set_bound_checked_up_to(preload_characters); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2903 | } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2904 | new_trace.quick_check_performed()->Clear(); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2905 | if (not_at_start_) new_trace.set_at_start(Trace::FALSE); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2906 | alt_gen->expects_preload = preload_is_current; |
| 2907 | bool generate_full_check_inline = false; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2908 | if (FLAG_regexp_optimization && |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2909 | try_to_emit_quick_check_for_alternative(i) && |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2910 | alternative.node()->EmitQuickCheck(compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2911 | &new_trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2912 | preload_has_checked_bounds, |
| 2913 | &alt_gen->possible_success, |
| 2914 | &alt_gen->quick_check_details, |
| 2915 | i < choice_count - 1)) { |
| 2916 | // Quick check was generated for this choice. |
| 2917 | preload_is_current = true; |
| 2918 | preload_has_checked_bounds = true; |
| 2919 | // On the last choice in the ChoiceNode we generated the quick |
| 2920 | // check to fall through on possible success. So now we need to |
| 2921 | // generate the full check inline. |
| 2922 | if (i == choice_count - 1) { |
| 2923 | macro_assembler->Bind(&alt_gen->possible_success); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2924 | new_trace.set_quick_check_performed(&alt_gen->quick_check_details); |
| 2925 | new_trace.set_characters_preloaded(preload_characters); |
| 2926 | new_trace.set_bound_checked_up_to(preload_characters); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2927 | generate_full_check_inline = true; |
| 2928 | } |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 2929 | } else if (alt_gen->quick_check_details.cannot_match()) { |
| 2930 | if (i == choice_count - 1 && !greedy_loop) { |
| 2931 | macro_assembler->GoTo(trace->backtrack()); |
| 2932 | } |
| 2933 | continue; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2934 | } else { |
| 2935 | // No quick check was generated. Put the full code here. |
| 2936 | // If this is not the first choice then there could be slow checks from |
| 2937 | // previous cases that go here when they fail. There's no reason to |
| 2938 | // insist that they preload characters since the slow check we are about |
| 2939 | // to generate probably can't use it. |
| 2940 | if (i != first_normal_choice) { |
| 2941 | alt_gen->expects_preload = false; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2942 | new_trace.set_characters_preloaded(0); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2943 | } |
| 2944 | if (i < choice_count - 1) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2945 | new_trace.set_backtrack(&alt_gen->after); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2946 | } |
| 2947 | generate_full_check_inline = true; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2948 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2949 | if (generate_full_check_inline) { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2950 | if (new_trace.actions() != NULL) { |
| 2951 | new_trace.set_flush_budget(new_flush_budget); |
| 2952 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2953 | for (int j = 0; j < guard_count; j++) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2954 | GenerateGuard(macro_assembler, guards->at(j), &new_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2955 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2956 | alternative.node()->Emit(compiler, &new_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2957 | preload_is_current = false; |
| 2958 | } |
| 2959 | macro_assembler->Bind(&alt_gen->after); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2960 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2961 | if (greedy_loop) { |
| 2962 | macro_assembler->Bind(&greedy_loop_label); |
| 2963 | // If we have unwound to the bottom then backtrack. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2964 | macro_assembler->CheckGreedyLoop(trace->backtrack()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 2965 | // Otherwise try the second priority at an earlier position. |
| 2966 | macro_assembler->AdvanceCurrentPosition(-text_length); |
| 2967 | macro_assembler->GoTo(&second_choice); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2968 | } |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2969 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2970 | // At this point we need to generate slow checks for the alternatives where |
| 2971 | // the quick check was inlined. We can recognize these because the associated |
| 2972 | // label was bound. |
| 2973 | for (int i = first_normal_choice; i < choice_count - 1; i++) { |
| 2974 | AlternativeGeneration* alt_gen = alt_gens.at(i); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2975 | Trace new_trace(*current_trace); |
| 2976 | // If there are actions to be flushed we have to limit how many times |
| 2977 | // they are flushed. Take the budget of the parent trace and distribute |
| 2978 | // it fairly amongst the children. |
| 2979 | if (new_trace.actions() != NULL) { |
| 2980 | new_trace.set_flush_budget(new_flush_budget); |
| 2981 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2982 | EmitOutOfLineContinuation(compiler, |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 2983 | &new_trace, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2984 | alternatives_->at(i), |
| 2985 | alt_gen, |
| 2986 | preload_characters, |
| 2987 | alt_gens.at(i + 1)->expects_preload); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2988 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2989 | } |
| 2990 | |
| 2991 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2992 | void ChoiceNode::EmitOutOfLineContinuation(RegExpCompiler* compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 2993 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2994 | GuardedAlternative alternative, |
| 2995 | AlternativeGeneration* alt_gen, |
| 2996 | int preload_characters, |
| 2997 | bool next_expects_preload) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2998 | if (!alt_gen->possible_success.is_linked()) return; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2999 | |
| 3000 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 3001 | macro_assembler->Bind(&alt_gen->possible_success); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3002 | Trace out_of_line_trace(*trace); |
| 3003 | out_of_line_trace.set_characters_preloaded(preload_characters); |
| 3004 | out_of_line_trace.set_quick_check_performed(&alt_gen->quick_check_details); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3005 | if (not_at_start_) out_of_line_trace.set_at_start(Trace::FALSE); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3006 | ZoneList<Guard*>* guards = alternative.guards(); |
| 3007 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
| 3008 | if (next_expects_preload) { |
| 3009 | Label reload_current_char; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3010 | out_of_line_trace.set_backtrack(&reload_current_char); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3011 | for (int j = 0; j < guard_count; j++) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3012 | GenerateGuard(macro_assembler, guards->at(j), &out_of_line_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3013 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3014 | alternative.node()->Emit(compiler, &out_of_line_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3015 | macro_assembler->Bind(&reload_current_char); |
| 3016 | // Reload the current character, since the next quick check expects that. |
| 3017 | // We don't need to check bounds here because we only get into this |
| 3018 | // code through a quick check which already did the checked load. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3019 | macro_assembler->LoadCurrentCharacter(trace->cp_offset(), |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3020 | NULL, |
| 3021 | false, |
| 3022 | preload_characters); |
| 3023 | macro_assembler->GoTo(&(alt_gen->after)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3024 | } else { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3025 | out_of_line_trace.set_backtrack(&(alt_gen->after)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3026 | for (int j = 0; j < guard_count; j++) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3027 | GenerateGuard(macro_assembler, guards->at(j), &out_of_line_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3028 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3029 | alternative.node()->Emit(compiler, &out_of_line_trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3030 | } |
| 3031 | } |
| 3032 | |
| 3033 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3034 | void ActionNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3035 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3036 | LimitResult limit_result = LimitVersions(compiler, trace); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3037 | if (limit_result == DONE) return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3038 | ASSERT(limit_result == CONTINUE); |
| 3039 | |
| 3040 | RecursionCheck rc(compiler); |
| 3041 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3042 | switch (type_) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3043 | case STORE_POSITION: { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3044 | Trace::DeferredCapture |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3045 | new_capture(data_.u_position_register.reg, |
| 3046 | data_.u_position_register.is_capture, |
| 3047 | trace); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3048 | Trace new_trace = *trace; |
| 3049 | new_trace.add_action(&new_capture); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3050 | on_success()->Emit(compiler, &new_trace); |
| 3051 | break; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3052 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3053 | case INCREMENT_REGISTER: { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3054 | Trace::DeferredIncrementRegister |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3055 | new_increment(data_.u_increment_register.reg); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3056 | Trace new_trace = *trace; |
| 3057 | new_trace.add_action(&new_increment); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3058 | on_success()->Emit(compiler, &new_trace); |
| 3059 | break; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3060 | } |
| 3061 | case SET_REGISTER: { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3062 | Trace::DeferredSetRegister |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3063 | new_set(data_.u_store_register.reg, data_.u_store_register.value); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3064 | Trace new_trace = *trace; |
| 3065 | new_trace.add_action(&new_set); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3066 | on_success()->Emit(compiler, &new_trace); |
| 3067 | break; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3068 | } |
| 3069 | case CLEAR_CAPTURES: { |
| 3070 | Trace::DeferredClearCaptures |
| 3071 | new_capture(Interval(data_.u_clear_captures.range_from, |
| 3072 | data_.u_clear_captures.range_to)); |
| 3073 | Trace new_trace = *trace; |
| 3074 | new_trace.add_action(&new_capture); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3075 | on_success()->Emit(compiler, &new_trace); |
| 3076 | break; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3077 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3078 | case BEGIN_SUBMATCH: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3079 | if (!trace->is_trivial()) { |
| 3080 | trace->Flush(compiler, this); |
| 3081 | } else { |
| 3082 | assembler->WriteCurrentPositionToRegister( |
| 3083 | data_.u_submatch.current_position_register, 0); |
| 3084 | assembler->WriteStackPointerToRegister( |
| 3085 | data_.u_submatch.stack_pointer_register); |
| 3086 | on_success()->Emit(compiler, trace); |
| 3087 | } |
| 3088 | break; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3089 | case EMPTY_MATCH_CHECK: { |
| 3090 | int start_pos_reg = data_.u_empty_match_check.start_register; |
| 3091 | int stored_pos = 0; |
| 3092 | int rep_reg = data_.u_empty_match_check.repetition_register; |
| 3093 | bool has_minimum = (rep_reg != RegExpCompiler::kNoRegister); |
| 3094 | bool know_dist = trace->GetStoredPosition(start_pos_reg, &stored_pos); |
| 3095 | if (know_dist && !has_minimum && stored_pos == trace->cp_offset()) { |
| 3096 | // If we know we haven't advanced and there is no minimum we |
| 3097 | // can just backtrack immediately. |
| 3098 | assembler->GoTo(trace->backtrack()); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3099 | } else if (know_dist && stored_pos < trace->cp_offset()) { |
| 3100 | // If we know we've advanced we can generate the continuation |
| 3101 | // immediately. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3102 | on_success()->Emit(compiler, trace); |
| 3103 | } else if (!trace->is_trivial()) { |
| 3104 | trace->Flush(compiler, this); |
| 3105 | } else { |
| 3106 | Label skip_empty_check; |
| 3107 | // If we have a minimum number of repetitions we check the current |
| 3108 | // number first and skip the empty check if it's not enough. |
| 3109 | if (has_minimum) { |
| 3110 | int limit = data_.u_empty_match_check.repetition_limit; |
| 3111 | assembler->IfRegisterLT(rep_reg, limit, &skip_empty_check); |
| 3112 | } |
| 3113 | // If the match is empty we bail out, otherwise we fall through |
| 3114 | // to the on-success continuation. |
| 3115 | assembler->IfRegisterEqPos(data_.u_empty_match_check.start_register, |
| 3116 | trace->backtrack()); |
| 3117 | assembler->Bind(&skip_empty_check); |
| 3118 | on_success()->Emit(compiler, trace); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3119 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3120 | break; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3121 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3122 | case POSITIVE_SUBMATCH_SUCCESS: { |
| 3123 | if (!trace->is_trivial()) { |
| 3124 | trace->Flush(compiler, this); |
| 3125 | return; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3126 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3127 | assembler->ReadCurrentPositionFromRegister( |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3128 | data_.u_submatch.current_position_register); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3129 | assembler->ReadStackPointerFromRegister( |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3130 | data_.u_submatch.stack_pointer_register); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3131 | int clear_register_count = data_.u_submatch.clear_register_count; |
| 3132 | if (clear_register_count == 0) { |
| 3133 | on_success()->Emit(compiler, trace); |
| 3134 | return; |
| 3135 | } |
| 3136 | int clear_registers_from = data_.u_submatch.clear_register_from; |
| 3137 | Label clear_registers_backtrack; |
| 3138 | Trace new_trace = *trace; |
| 3139 | new_trace.set_backtrack(&clear_registers_backtrack); |
| 3140 | on_success()->Emit(compiler, &new_trace); |
| 3141 | |
| 3142 | assembler->Bind(&clear_registers_backtrack); |
| 3143 | int clear_registers_to = clear_registers_from + clear_register_count - 1; |
| 3144 | assembler->ClearRegisters(clear_registers_from, clear_registers_to); |
| 3145 | |
| 3146 | ASSERT(trace->backtrack() == NULL); |
| 3147 | assembler->Backtrack(); |
| 3148 | return; |
| 3149 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3150 | default: |
| 3151 | UNREACHABLE(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3152 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3153 | } |
| 3154 | |
| 3155 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3156 | void BackReferenceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3157 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3158 | if (!trace->is_trivial()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3159 | trace->Flush(compiler, this); |
| 3160 | return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3161 | } |
| 3162 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3163 | LimitResult limit_result = LimitVersions(compiler, trace); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3164 | if (limit_result == DONE) return; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3165 | ASSERT(limit_result == CONTINUE); |
| 3166 | |
| 3167 | RecursionCheck rc(compiler); |
| 3168 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3169 | ASSERT_EQ(start_reg_ + 1, end_reg_); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3170 | if (compiler->ignore_case()) { |
| 3171 | assembler->CheckNotBackReferenceIgnoreCase(start_reg_, |
| 3172 | trace->backtrack()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3173 | } else { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3174 | assembler->CheckNotBackReference(start_reg_, trace->backtrack()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3175 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3176 | on_success()->Emit(compiler, trace); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3177 | } |
| 3178 | |
| 3179 | |
| 3180 | // ------------------------------------------------------------------- |
| 3181 | // Dot/dotty output |
| 3182 | |
| 3183 | |
| 3184 | #ifdef DEBUG |
| 3185 | |
| 3186 | |
| 3187 | class DotPrinter: public NodeVisitor { |
| 3188 | public: |
| 3189 | explicit DotPrinter(bool ignore_case) |
| 3190 | : ignore_case_(ignore_case), |
| 3191 | stream_(&alloc_) { } |
| 3192 | void PrintNode(const char* label, RegExpNode* node); |
| 3193 | void Visit(RegExpNode* node); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3194 | void PrintAttributes(RegExpNode* from); |
| 3195 | StringStream* stream() { return &stream_; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3196 | void PrintOnFailure(RegExpNode* from, RegExpNode* to); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3197 | #define DECLARE_VISIT(Type) \ |
| 3198 | virtual void Visit##Type(Type##Node* that); |
| 3199 | FOR_EACH_NODE_TYPE(DECLARE_VISIT) |
| 3200 | #undef DECLARE_VISIT |
| 3201 | private: |
| 3202 | bool ignore_case_; |
| 3203 | HeapStringAllocator alloc_; |
| 3204 | StringStream stream_; |
| 3205 | }; |
| 3206 | |
| 3207 | |
| 3208 | void DotPrinter::PrintNode(const char* label, RegExpNode* node) { |
| 3209 | stream()->Add("digraph G {\n graph [label=\""); |
| 3210 | for (int i = 0; label[i]; i++) { |
| 3211 | switch (label[i]) { |
| 3212 | case '\\': |
| 3213 | stream()->Add("\\\\"); |
| 3214 | break; |
| 3215 | case '"': |
| 3216 | stream()->Add("\""); |
| 3217 | break; |
| 3218 | default: |
| 3219 | stream()->Put(label[i]); |
| 3220 | break; |
| 3221 | } |
| 3222 | } |
| 3223 | stream()->Add("\"];\n"); |
| 3224 | Visit(node); |
| 3225 | stream()->Add("}\n"); |
| 3226 | printf("%s", *(stream()->ToCString())); |
| 3227 | } |
| 3228 | |
| 3229 | |
| 3230 | void DotPrinter::Visit(RegExpNode* node) { |
| 3231 | if (node->info()->visited) return; |
| 3232 | node->info()->visited = true; |
| 3233 | node->Accept(this); |
| 3234 | } |
| 3235 | |
| 3236 | |
| 3237 | void DotPrinter::PrintOnFailure(RegExpNode* from, RegExpNode* on_failure) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3238 | stream()->Add(" n%p -> n%p [style=dotted];\n", from, on_failure); |
| 3239 | Visit(on_failure); |
| 3240 | } |
| 3241 | |
| 3242 | |
| 3243 | class TableEntryBodyPrinter { |
| 3244 | public: |
| 3245 | TableEntryBodyPrinter(StringStream* stream, ChoiceNode* choice) |
| 3246 | : stream_(stream), choice_(choice) { } |
| 3247 | void Call(uc16 from, DispatchTable::Entry entry) { |
| 3248 | OutSet* out_set = entry.out_set(); |
| 3249 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 3250 | if (out_set->Get(i)) { |
| 3251 | stream()->Add(" n%p:s%io%i -> n%p;\n", |
| 3252 | choice(), |
| 3253 | from, |
| 3254 | i, |
| 3255 | choice()->alternatives()->at(i).node()); |
| 3256 | } |
| 3257 | } |
| 3258 | } |
| 3259 | private: |
| 3260 | StringStream* stream() { return stream_; } |
| 3261 | ChoiceNode* choice() { return choice_; } |
| 3262 | StringStream* stream_; |
| 3263 | ChoiceNode* choice_; |
| 3264 | }; |
| 3265 | |
| 3266 | |
| 3267 | class TableEntryHeaderPrinter { |
| 3268 | public: |
| 3269 | explicit TableEntryHeaderPrinter(StringStream* stream) |
| 3270 | : first_(true), stream_(stream) { } |
| 3271 | void Call(uc16 from, DispatchTable::Entry entry) { |
| 3272 | if (first_) { |
| 3273 | first_ = false; |
| 3274 | } else { |
| 3275 | stream()->Add("|"); |
| 3276 | } |
| 3277 | stream()->Add("{\\%k-\\%k|{", from, entry.to()); |
| 3278 | OutSet* out_set = entry.out_set(); |
| 3279 | int priority = 0; |
| 3280 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 3281 | if (out_set->Get(i)) { |
| 3282 | if (priority > 0) stream()->Add("|"); |
| 3283 | stream()->Add("<s%io%i> %i", from, i, priority); |
| 3284 | priority++; |
| 3285 | } |
| 3286 | } |
| 3287 | stream()->Add("}}"); |
| 3288 | } |
| 3289 | private: |
| 3290 | bool first_; |
| 3291 | StringStream* stream() { return stream_; } |
| 3292 | StringStream* stream_; |
| 3293 | }; |
| 3294 | |
| 3295 | |
| 3296 | class AttributePrinter { |
| 3297 | public: |
| 3298 | explicit AttributePrinter(DotPrinter* out) |
| 3299 | : out_(out), first_(true) { } |
| 3300 | void PrintSeparator() { |
| 3301 | if (first_) { |
| 3302 | first_ = false; |
| 3303 | } else { |
| 3304 | out_->stream()->Add("|"); |
| 3305 | } |
| 3306 | } |
| 3307 | void PrintBit(const char* name, bool value) { |
| 3308 | if (!value) return; |
| 3309 | PrintSeparator(); |
| 3310 | out_->stream()->Add("{%s}", name); |
| 3311 | } |
| 3312 | void PrintPositive(const char* name, int value) { |
| 3313 | if (value < 0) return; |
| 3314 | PrintSeparator(); |
| 3315 | out_->stream()->Add("{%s|%x}", name, value); |
| 3316 | } |
| 3317 | private: |
| 3318 | DotPrinter* out_; |
| 3319 | bool first_; |
| 3320 | }; |
| 3321 | |
| 3322 | |
| 3323 | void DotPrinter::PrintAttributes(RegExpNode* that) { |
| 3324 | stream()->Add(" a%p [shape=Mrecord, color=grey, fontcolor=grey, " |
| 3325 | "margin=0.1, fontsize=10, label=\"{", |
| 3326 | that); |
| 3327 | AttributePrinter printer(this); |
| 3328 | NodeInfo* info = that->info(); |
| 3329 | printer.PrintBit("NI", info->follows_newline_interest); |
| 3330 | printer.PrintBit("WI", info->follows_word_interest); |
| 3331 | printer.PrintBit("SI", info->follows_start_interest); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3332 | Label* label = that->label(); |
| 3333 | if (label->is_bound()) |
| 3334 | printer.PrintPositive("@", label->pos()); |
| 3335 | stream()->Add("}\"];\n"); |
| 3336 | stream()->Add(" a%p -> n%p [style=dashed, color=grey, " |
| 3337 | "arrowhead=none];\n", that, that); |
| 3338 | } |
| 3339 | |
| 3340 | |
| 3341 | static const bool kPrintDispatchTable = false; |
| 3342 | void DotPrinter::VisitChoice(ChoiceNode* that) { |
| 3343 | if (kPrintDispatchTable) { |
| 3344 | stream()->Add(" n%p [shape=Mrecord, label=\"", that); |
| 3345 | TableEntryHeaderPrinter header_printer(stream()); |
| 3346 | that->GetTable(ignore_case_)->ForEach(&header_printer); |
| 3347 | stream()->Add("\"]\n", that); |
| 3348 | PrintAttributes(that); |
| 3349 | TableEntryBodyPrinter body_printer(stream(), that); |
| 3350 | that->GetTable(ignore_case_)->ForEach(&body_printer); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3351 | } else { |
| 3352 | stream()->Add(" n%p [shape=Mrecord, label=\"?\"];\n", that); |
| 3353 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 3354 | GuardedAlternative alt = that->alternatives()->at(i); |
| 3355 | stream()->Add(" n%p -> n%p;\n", that, alt.node()); |
| 3356 | } |
| 3357 | } |
| 3358 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 3359 | GuardedAlternative alt = that->alternatives()->at(i); |
| 3360 | alt.node()->Accept(this); |
| 3361 | } |
| 3362 | } |
| 3363 | |
| 3364 | |
| 3365 | void DotPrinter::VisitText(TextNode* that) { |
| 3366 | stream()->Add(" n%p [label=\"", that); |
| 3367 | for (int i = 0; i < that->elements()->length(); i++) { |
| 3368 | if (i > 0) stream()->Add(" "); |
| 3369 | TextElement elm = that->elements()->at(i); |
| 3370 | switch (elm.type) { |
| 3371 | case TextElement::ATOM: { |
| 3372 | stream()->Add("'%w'", elm.data.u_atom->data()); |
| 3373 | break; |
| 3374 | } |
| 3375 | case TextElement::CHAR_CLASS: { |
| 3376 | RegExpCharacterClass* node = elm.data.u_char_class; |
| 3377 | stream()->Add("["); |
| 3378 | if (node->is_negated()) |
| 3379 | stream()->Add("^"); |
| 3380 | for (int j = 0; j < node->ranges()->length(); j++) { |
| 3381 | CharacterRange range = node->ranges()->at(j); |
| 3382 | stream()->Add("%k-%k", range.from(), range.to()); |
| 3383 | } |
| 3384 | stream()->Add("]"); |
| 3385 | break; |
| 3386 | } |
| 3387 | default: |
| 3388 | UNREACHABLE(); |
| 3389 | } |
| 3390 | } |
| 3391 | stream()->Add("\", shape=box, peripheries=2];\n"); |
| 3392 | PrintAttributes(that); |
| 3393 | stream()->Add(" n%p -> n%p;\n", that, that->on_success()); |
| 3394 | Visit(that->on_success()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3395 | } |
| 3396 | |
| 3397 | |
| 3398 | void DotPrinter::VisitBackReference(BackReferenceNode* that) { |
| 3399 | stream()->Add(" n%p [label=\"$%i..$%i\", shape=doubleoctagon];\n", |
| 3400 | that, |
| 3401 | that->start_register(), |
| 3402 | that->end_register()); |
| 3403 | PrintAttributes(that); |
| 3404 | stream()->Add(" n%p -> n%p;\n", that, that->on_success()); |
| 3405 | Visit(that->on_success()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3406 | } |
| 3407 | |
| 3408 | |
| 3409 | void DotPrinter::VisitEnd(EndNode* that) { |
| 3410 | stream()->Add(" n%p [style=bold, shape=point];\n", that); |
| 3411 | PrintAttributes(that); |
| 3412 | } |
| 3413 | |
| 3414 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3415 | void DotPrinter::VisitAssertion(AssertionNode* that) { |
| 3416 | stream()->Add(" n%p [", that); |
| 3417 | switch (that->type()) { |
| 3418 | case AssertionNode::AT_END: |
| 3419 | stream()->Add("label=\"$\", shape=septagon"); |
| 3420 | break; |
| 3421 | case AssertionNode::AT_START: |
| 3422 | stream()->Add("label=\"^\", shape=septagon"); |
| 3423 | break; |
| 3424 | case AssertionNode::AT_BOUNDARY: |
| 3425 | stream()->Add("label=\"\\b\", shape=septagon"); |
| 3426 | break; |
| 3427 | case AssertionNode::AT_NON_BOUNDARY: |
| 3428 | stream()->Add("label=\"\\B\", shape=septagon"); |
| 3429 | break; |
| 3430 | case AssertionNode::AFTER_NEWLINE: |
| 3431 | stream()->Add("label=\"(?<=\\n)\", shape=septagon"); |
| 3432 | break; |
| 3433 | } |
| 3434 | stream()->Add("];\n"); |
| 3435 | PrintAttributes(that); |
| 3436 | RegExpNode* successor = that->on_success(); |
| 3437 | stream()->Add(" n%p -> n%p;\n", that, successor); |
| 3438 | Visit(successor); |
| 3439 | } |
| 3440 | |
| 3441 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3442 | void DotPrinter::VisitAction(ActionNode* that) { |
| 3443 | stream()->Add(" n%p [", that); |
| 3444 | switch (that->type_) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3445 | case ActionNode::SET_REGISTER: |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3446 | stream()->Add("label=\"$%i:=%i\", shape=octagon", |
| 3447 | that->data_.u_store_register.reg, |
| 3448 | that->data_.u_store_register.value); |
| 3449 | break; |
| 3450 | case ActionNode::INCREMENT_REGISTER: |
| 3451 | stream()->Add("label=\"$%i++\", shape=octagon", |
| 3452 | that->data_.u_increment_register.reg); |
| 3453 | break; |
| 3454 | case ActionNode::STORE_POSITION: |
| 3455 | stream()->Add("label=\"$%i:=$pos\", shape=octagon", |
| 3456 | that->data_.u_position_register.reg); |
| 3457 | break; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3458 | case ActionNode::BEGIN_SUBMATCH: |
| 3459 | stream()->Add("label=\"$%i:=$pos,begin\", shape=septagon", |
| 3460 | that->data_.u_submatch.current_position_register); |
| 3461 | break; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3462 | case ActionNode::POSITIVE_SUBMATCH_SUCCESS: |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3463 | stream()->Add("label=\"escape\", shape=septagon"); |
| 3464 | break; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3465 | case ActionNode::EMPTY_MATCH_CHECK: |
| 3466 | stream()->Add("label=\"$%i=$pos?,$%i<%i?\", shape=septagon", |
| 3467 | that->data_.u_empty_match_check.start_register, |
| 3468 | that->data_.u_empty_match_check.repetition_register, |
| 3469 | that->data_.u_empty_match_check.repetition_limit); |
| 3470 | break; |
| 3471 | case ActionNode::CLEAR_CAPTURES: { |
| 3472 | stream()->Add("label=\"clear $%i to $%i\", shape=septagon", |
| 3473 | that->data_.u_clear_captures.range_from, |
| 3474 | that->data_.u_clear_captures.range_to); |
| 3475 | break; |
| 3476 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3477 | } |
| 3478 | stream()->Add("];\n"); |
| 3479 | PrintAttributes(that); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3480 | RegExpNode* successor = that->on_success(); |
| 3481 | stream()->Add(" n%p -> n%p;\n", that, successor); |
| 3482 | Visit(successor); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3483 | } |
| 3484 | |
| 3485 | |
| 3486 | class DispatchTableDumper { |
| 3487 | public: |
| 3488 | explicit DispatchTableDumper(StringStream* stream) : stream_(stream) { } |
| 3489 | void Call(uc16 key, DispatchTable::Entry entry); |
| 3490 | StringStream* stream() { return stream_; } |
| 3491 | private: |
| 3492 | StringStream* stream_; |
| 3493 | }; |
| 3494 | |
| 3495 | |
| 3496 | void DispatchTableDumper::Call(uc16 key, DispatchTable::Entry entry) { |
| 3497 | stream()->Add("[%k-%k]: {", key, entry.to()); |
| 3498 | OutSet* set = entry.out_set(); |
| 3499 | bool first = true; |
| 3500 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 3501 | if (set->Get(i)) { |
| 3502 | if (first) { |
| 3503 | first = false; |
| 3504 | } else { |
| 3505 | stream()->Add(", "); |
| 3506 | } |
| 3507 | stream()->Add("%i", i); |
| 3508 | } |
| 3509 | } |
| 3510 | stream()->Add("}\n"); |
| 3511 | } |
| 3512 | |
| 3513 | |
| 3514 | void DispatchTable::Dump() { |
| 3515 | HeapStringAllocator alloc; |
| 3516 | StringStream stream(&alloc); |
| 3517 | DispatchTableDumper dumper(&stream); |
| 3518 | tree()->ForEach(&dumper); |
| 3519 | OS::PrintError("%s", *stream.ToCString()); |
| 3520 | } |
| 3521 | |
| 3522 | |
| 3523 | void RegExpEngine::DotPrint(const char* label, |
| 3524 | RegExpNode* node, |
| 3525 | bool ignore_case) { |
| 3526 | DotPrinter printer(ignore_case); |
| 3527 | printer.PrintNode(label, node); |
| 3528 | } |
| 3529 | |
| 3530 | |
| 3531 | #endif // DEBUG |
| 3532 | |
| 3533 | |
| 3534 | // ------------------------------------------------------------------- |
| 3535 | // Tree to graph conversion |
| 3536 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3537 | static const int kSpaceRangeCount = 20; |
| 3538 | static const int kSpaceRangeAsciiCount = 4; |
| 3539 | static const uc16 kSpaceRanges[kSpaceRangeCount] = { 0x0009, 0x000D, 0x0020, |
| 3540 | 0x0020, 0x00A0, 0x00A0, 0x1680, 0x1680, 0x180E, 0x180E, 0x2000, 0x200A, |
| 3541 | 0x2028, 0x2029, 0x202F, 0x202F, 0x205F, 0x205F, 0x3000, 0x3000 }; |
| 3542 | |
| 3543 | static const int kWordRangeCount = 8; |
| 3544 | static const uc16 kWordRanges[kWordRangeCount] = { '0', '9', 'A', 'Z', '_', |
| 3545 | '_', 'a', 'z' }; |
| 3546 | |
| 3547 | static const int kDigitRangeCount = 2; |
| 3548 | static const uc16 kDigitRanges[kDigitRangeCount] = { '0', '9' }; |
| 3549 | |
| 3550 | static const int kLineTerminatorRangeCount = 6; |
| 3551 | static const uc16 kLineTerminatorRanges[kLineTerminatorRangeCount] = { 0x000A, |
| 3552 | 0x000A, 0x000D, 0x000D, 0x2028, 0x2029 }; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3553 | |
| 3554 | RegExpNode* RegExpAtom::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3555 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3556 | ZoneList<TextElement>* elms = new ZoneList<TextElement>(1); |
| 3557 | elms->Add(TextElement::Atom(this)); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3558 | return new TextNode(elms, on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3559 | } |
| 3560 | |
| 3561 | |
| 3562 | RegExpNode* RegExpText::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3563 | RegExpNode* on_success) { |
| 3564 | return new TextNode(elements(), on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3565 | } |
| 3566 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3567 | static bool CompareInverseRanges(ZoneList<CharacterRange>* ranges, |
| 3568 | const uc16* special_class, |
| 3569 | int length) { |
| 3570 | ASSERT(ranges->length() != 0); |
| 3571 | ASSERT(length != 0); |
| 3572 | ASSERT(special_class[0] != 0); |
| 3573 | if (ranges->length() != (length >> 1) + 1) { |
| 3574 | return false; |
| 3575 | } |
| 3576 | CharacterRange range = ranges->at(0); |
| 3577 | if (range.from() != 0) { |
| 3578 | return false; |
| 3579 | } |
| 3580 | for (int i = 0; i < length; i += 2) { |
| 3581 | if (special_class[i] != (range.to() + 1)) { |
| 3582 | return false; |
| 3583 | } |
| 3584 | range = ranges->at((i >> 1) + 1); |
| 3585 | if (special_class[i+1] != range.from() - 1) { |
| 3586 | return false; |
| 3587 | } |
| 3588 | } |
| 3589 | if (range.to() != 0xffff) { |
| 3590 | return false; |
| 3591 | } |
| 3592 | return true; |
| 3593 | } |
| 3594 | |
| 3595 | |
| 3596 | static bool CompareRanges(ZoneList<CharacterRange>* ranges, |
| 3597 | const uc16* special_class, |
| 3598 | int length) { |
| 3599 | if (ranges->length() * 2 != length) { |
| 3600 | return false; |
| 3601 | } |
| 3602 | for (int i = 0; i < length; i += 2) { |
| 3603 | CharacterRange range = ranges->at(i >> 1); |
| 3604 | if (range.from() != special_class[i] || range.to() != special_class[i+1]) { |
| 3605 | return false; |
| 3606 | } |
| 3607 | } |
| 3608 | return true; |
| 3609 | } |
| 3610 | |
| 3611 | |
| 3612 | bool RegExpCharacterClass::is_standard() { |
| 3613 | // TODO(lrn): Remove need for this function, by not throwing away information |
| 3614 | // along the way. |
| 3615 | if (is_negated_) { |
| 3616 | return false; |
| 3617 | } |
| 3618 | if (set_.is_standard()) { |
| 3619 | return true; |
| 3620 | } |
| 3621 | if (CompareRanges(set_.ranges(), kSpaceRanges, kSpaceRangeCount)) { |
| 3622 | set_.set_standard_set_type('s'); |
| 3623 | return true; |
| 3624 | } |
| 3625 | if (CompareInverseRanges(set_.ranges(), kSpaceRanges, kSpaceRangeCount)) { |
| 3626 | set_.set_standard_set_type('S'); |
| 3627 | return true; |
| 3628 | } |
| 3629 | if (CompareInverseRanges(set_.ranges(), |
| 3630 | kLineTerminatorRanges, |
| 3631 | kLineTerminatorRangeCount)) { |
| 3632 | set_.set_standard_set_type('.'); |
| 3633 | return true; |
| 3634 | } |
| 3635 | return false; |
| 3636 | } |
| 3637 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3638 | |
| 3639 | RegExpNode* RegExpCharacterClass::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3640 | RegExpNode* on_success) { |
| 3641 | return new TextNode(this, on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3642 | } |
| 3643 | |
| 3644 | |
| 3645 | RegExpNode* RegExpDisjunction::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3646 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3647 | ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| 3648 | int length = alternatives->length(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3649 | ChoiceNode* result = new ChoiceNode(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3650 | for (int i = 0; i < length; i++) { |
| 3651 | GuardedAlternative alternative(alternatives->at(i)->ToNode(compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3652 | on_success)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3653 | result->AddAlternative(alternative); |
| 3654 | } |
| 3655 | return result; |
| 3656 | } |
| 3657 | |
| 3658 | |
| 3659 | RegExpNode* RegExpQuantifier::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3660 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3661 | return ToNode(min(), |
| 3662 | max(), |
| 3663 | is_greedy(), |
| 3664 | body(), |
| 3665 | compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3666 | on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3667 | } |
| 3668 | |
| 3669 | |
| 3670 | RegExpNode* RegExpQuantifier::ToNode(int min, |
| 3671 | int max, |
| 3672 | bool is_greedy, |
| 3673 | RegExpTree* body, |
| 3674 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3675 | RegExpNode* on_success, |
| 3676 | bool not_at_start) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3677 | // x{f, t} becomes this: |
| 3678 | // |
| 3679 | // (r++)<-. |
| 3680 | // | ` |
| 3681 | // | (x) |
| 3682 | // v ^ |
| 3683 | // (r=0)-->(?)---/ [if r < t] |
| 3684 | // | |
| 3685 | // [if r >= f] \----> ... |
| 3686 | // |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3687 | |
| 3688 | // 15.10.2.5 RepeatMatcher algorithm. |
| 3689 | // The parser has already eliminated the case where max is 0. In the case |
| 3690 | // where max_match is zero the parser has removed the quantifier if min was |
| 3691 | // > 0 and removed the atom if min was 0. See AddQuantifierToAtom. |
| 3692 | |
| 3693 | // If we know that we cannot match zero length then things are a little |
| 3694 | // simpler since we don't need to make the special zero length match check |
| 3695 | // from step 2.1. If the min and max are small we can unroll a little in |
| 3696 | // this case. |
| 3697 | static const int kMaxUnrolledMinMatches = 3; // Unroll (foo)+ and (foo){3,} |
| 3698 | static const int kMaxUnrolledMaxMatches = 3; // Unroll (foo)? and (foo){x,3} |
| 3699 | if (max == 0) return on_success; // This can happen due to recursion. |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3700 | bool body_can_be_empty = (body->min_match() == 0); |
| 3701 | int body_start_reg = RegExpCompiler::kNoRegister; |
| 3702 | Interval capture_registers = body->CaptureRegisters(); |
| 3703 | bool needs_capture_clearing = !capture_registers.is_empty(); |
| 3704 | if (body_can_be_empty) { |
| 3705 | body_start_reg = compiler->AllocateRegister(); |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 3706 | } else if (FLAG_regexp_optimization && !needs_capture_clearing) { |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3707 | // Only unroll if there are no captures and the body can't be |
| 3708 | // empty. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3709 | if (min > 0 && min <= kMaxUnrolledMinMatches) { |
| 3710 | int new_max = (max == kInfinity) ? max : max - min; |
| 3711 | // Recurse once to get the loop or optional matches after the fixed ones. |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3712 | RegExpNode* answer = ToNode( |
| 3713 | 0, new_max, is_greedy, body, compiler, on_success, true); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3714 | // Unroll the forced matches from 0 to min. This can cause chains of |
| 3715 | // TextNodes (which the parser does not generate). These should be |
| 3716 | // combined if it turns out they hinder good code generation. |
| 3717 | for (int i = 0; i < min; i++) { |
| 3718 | answer = body->ToNode(compiler, answer); |
| 3719 | } |
| 3720 | return answer; |
| 3721 | } |
| 3722 | if (max <= kMaxUnrolledMaxMatches) { |
| 3723 | ASSERT(min == 0); |
| 3724 | // Unroll the optional matches up to max. |
| 3725 | RegExpNode* answer = on_success; |
| 3726 | for (int i = 0; i < max; i++) { |
| 3727 | ChoiceNode* alternation = new ChoiceNode(2); |
| 3728 | if (is_greedy) { |
| 3729 | alternation->AddAlternative(GuardedAlternative(body->ToNode(compiler, |
| 3730 | answer))); |
| 3731 | alternation->AddAlternative(GuardedAlternative(on_success)); |
| 3732 | } else { |
| 3733 | alternation->AddAlternative(GuardedAlternative(on_success)); |
| 3734 | alternation->AddAlternative(GuardedAlternative(body->ToNode(compiler, |
| 3735 | answer))); |
| 3736 | } |
| 3737 | answer = alternation; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3738 | if (not_at_start) alternation->set_not_at_start(); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3739 | } |
| 3740 | return answer; |
| 3741 | } |
| 3742 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3743 | bool has_min = min > 0; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3744 | bool has_max = max < RegExpTree::kInfinity; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3745 | bool needs_counter = has_min || has_max; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3746 | int reg_ctr = needs_counter |
| 3747 | ? compiler->AllocateRegister() |
| 3748 | : RegExpCompiler::kNoRegister; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3749 | LoopChoiceNode* center = new LoopChoiceNode(body->min_match() == 0); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3750 | if (not_at_start) center->set_not_at_start(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3751 | RegExpNode* loop_return = needs_counter |
| 3752 | ? static_cast<RegExpNode*>(ActionNode::IncrementRegister(reg_ctr, center)) |
| 3753 | : static_cast<RegExpNode*>(center); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3754 | if (body_can_be_empty) { |
| 3755 | // If the body can be empty we need to check if it was and then |
| 3756 | // backtrack. |
| 3757 | loop_return = ActionNode::EmptyMatchCheck(body_start_reg, |
| 3758 | reg_ctr, |
| 3759 | min, |
| 3760 | loop_return); |
| 3761 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3762 | RegExpNode* body_node = body->ToNode(compiler, loop_return); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3763 | if (body_can_be_empty) { |
| 3764 | // If the body can be empty we need to store the start position |
| 3765 | // so we can bail out if it was empty. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3766 | body_node = ActionNode::StorePosition(body_start_reg, false, body_node); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3767 | } |
| 3768 | if (needs_capture_clearing) { |
| 3769 | // Before entering the body of this loop we need to clear captures. |
| 3770 | body_node = ActionNode::ClearCaptures(capture_registers, body_node); |
| 3771 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3772 | GuardedAlternative body_alt(body_node); |
| 3773 | if (has_max) { |
| 3774 | Guard* body_guard = new Guard(reg_ctr, Guard::LT, max); |
| 3775 | body_alt.AddGuard(body_guard); |
| 3776 | } |
| 3777 | GuardedAlternative rest_alt(on_success); |
| 3778 | if (has_min) { |
| 3779 | Guard* rest_guard = new Guard(reg_ctr, Guard::GEQ, min); |
| 3780 | rest_alt.AddGuard(rest_guard); |
| 3781 | } |
| 3782 | if (is_greedy) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3783 | center->AddLoopAlternative(body_alt); |
| 3784 | center->AddContinueAlternative(rest_alt); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3785 | } else { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3786 | center->AddContinueAlternative(rest_alt); |
| 3787 | center->AddLoopAlternative(body_alt); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3788 | } |
| 3789 | if (needs_counter) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3790 | return ActionNode::SetRegister(reg_ctr, 0, center); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3791 | } else { |
| 3792 | return center; |
| 3793 | } |
| 3794 | } |
| 3795 | |
| 3796 | |
| 3797 | RegExpNode* RegExpAssertion::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3798 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3799 | NodeInfo info; |
| 3800 | switch (type()) { |
| 3801 | case START_OF_LINE: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3802 | return AssertionNode::AfterNewline(on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3803 | case START_OF_INPUT: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3804 | return AssertionNode::AtStart(on_success); |
| 3805 | case BOUNDARY: |
| 3806 | return AssertionNode::AtBoundary(on_success); |
| 3807 | case NON_BOUNDARY: |
| 3808 | return AssertionNode::AtNonBoundary(on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3809 | case END_OF_INPUT: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3810 | return AssertionNode::AtEnd(on_success); |
| 3811 | case END_OF_LINE: { |
| 3812 | // Compile $ in multiline regexps as an alternation with a positive |
| 3813 | // lookahead in one side and an end-of-input on the other side. |
| 3814 | // We need two registers for the lookahead. |
| 3815 | int stack_pointer_register = compiler->AllocateRegister(); |
| 3816 | int position_register = compiler->AllocateRegister(); |
| 3817 | // The ChoiceNode to distinguish between a newline and end-of-input. |
| 3818 | ChoiceNode* result = new ChoiceNode(2); |
| 3819 | // Create a newline atom. |
| 3820 | ZoneList<CharacterRange>* newline_ranges = |
| 3821 | new ZoneList<CharacterRange>(3); |
| 3822 | CharacterRange::AddClassEscape('n', newline_ranges); |
| 3823 | RegExpCharacterClass* newline_atom = new RegExpCharacterClass('n'); |
| 3824 | TextNode* newline_matcher = new TextNode( |
| 3825 | newline_atom, |
| 3826 | ActionNode::PositiveSubmatchSuccess(stack_pointer_register, |
| 3827 | position_register, |
| 3828 | 0, // No captures inside. |
| 3829 | -1, // Ignored if no captures. |
| 3830 | on_success)); |
| 3831 | // Create an end-of-input matcher. |
| 3832 | RegExpNode* end_of_line = ActionNode::BeginSubmatch( |
| 3833 | stack_pointer_register, |
| 3834 | position_register, |
| 3835 | newline_matcher); |
| 3836 | // Add the two alternatives to the ChoiceNode. |
| 3837 | GuardedAlternative eol_alternative(end_of_line); |
| 3838 | result->AddAlternative(eol_alternative); |
| 3839 | GuardedAlternative end_alternative(AssertionNode::AtEnd(on_success)); |
| 3840 | result->AddAlternative(end_alternative); |
| 3841 | return result; |
| 3842 | } |
| 3843 | default: |
| 3844 | UNREACHABLE(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3845 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3846 | return on_success; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3847 | } |
| 3848 | |
| 3849 | |
| 3850 | RegExpNode* RegExpBackReference::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3851 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3852 | return new BackReferenceNode(RegExpCapture::StartRegister(index()), |
| 3853 | RegExpCapture::EndRegister(index()), |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3854 | on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3855 | } |
| 3856 | |
| 3857 | |
| 3858 | RegExpNode* RegExpEmpty::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3859 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3860 | return on_success; |
| 3861 | } |
| 3862 | |
| 3863 | |
| 3864 | RegExpNode* RegExpLookahead::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3865 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3866 | int stack_pointer_register = compiler->AllocateRegister(); |
| 3867 | int position_register = compiler->AllocateRegister(); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3868 | |
| 3869 | const int registers_per_capture = 2; |
| 3870 | const int register_of_first_capture = 2; |
| 3871 | int register_count = capture_count_ * registers_per_capture; |
| 3872 | int register_start = |
| 3873 | register_of_first_capture + capture_from_ * registers_per_capture; |
| 3874 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3875 | RegExpNode* success; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3876 | if (is_positive()) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3877 | RegExpNode* node = ActionNode::BeginSubmatch( |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3878 | stack_pointer_register, |
| 3879 | position_register, |
| 3880 | body()->ToNode( |
| 3881 | compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3882 | ActionNode::PositiveSubmatchSuccess(stack_pointer_register, |
| 3883 | position_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3884 | register_count, |
| 3885 | register_start, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3886 | on_success))); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3887 | return node; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3888 | } else { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3889 | // We use a ChoiceNode for a negative lookahead because it has most of |
| 3890 | // the characteristics we need. It has the body of the lookahead as its |
| 3891 | // first alternative and the expression after the lookahead of the second |
| 3892 | // alternative. If the first alternative succeeds then the |
| 3893 | // NegativeSubmatchSuccess will unwind the stack including everything the |
| 3894 | // choice node set up and backtrack. If the first alternative fails then |
| 3895 | // the second alternative is tried, which is exactly the desired result |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3896 | // for a negative lookahead. The NegativeLookaheadChoiceNode is a special |
| 3897 | // ChoiceNode that knows to ignore the first exit when calculating quick |
| 3898 | // checks. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3899 | GuardedAlternative body_alt( |
| 3900 | body()->ToNode( |
| 3901 | compiler, |
| 3902 | success = new NegativeSubmatchSuccess(stack_pointer_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3903 | position_register, |
| 3904 | register_count, |
| 3905 | register_start))); |
| 3906 | ChoiceNode* choice_node = |
| 3907 | new NegativeLookaheadChoiceNode(body_alt, |
| 3908 | GuardedAlternative(on_success)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3909 | return ActionNode::BeginSubmatch(stack_pointer_register, |
| 3910 | position_register, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3911 | choice_node); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3912 | } |
| 3913 | } |
| 3914 | |
| 3915 | |
| 3916 | RegExpNode* RegExpCapture::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3917 | RegExpNode* on_success) { |
| 3918 | return ToNode(body(), index(), compiler, on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3919 | } |
| 3920 | |
| 3921 | |
| 3922 | RegExpNode* RegExpCapture::ToNode(RegExpTree* body, |
| 3923 | int index, |
| 3924 | RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3925 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3926 | int start_reg = RegExpCapture::StartRegister(index); |
| 3927 | int end_reg = RegExpCapture::EndRegister(index); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3928 | RegExpNode* store_end = ActionNode::StorePosition(end_reg, true, on_success); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3929 | RegExpNode* body_node = body->ToNode(compiler, store_end); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3930 | return ActionNode::StorePosition(start_reg, true, body_node); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3931 | } |
| 3932 | |
| 3933 | |
| 3934 | RegExpNode* RegExpAlternative::ToNode(RegExpCompiler* compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3935 | RegExpNode* on_success) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3936 | ZoneList<RegExpTree*>* children = nodes(); |
| 3937 | RegExpNode* current = on_success; |
| 3938 | for (int i = children->length() - 1; i >= 0; i--) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3939 | current = children->at(i)->ToNode(compiler, current); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3940 | } |
| 3941 | return current; |
| 3942 | } |
| 3943 | |
| 3944 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3945 | static void AddClass(const uc16* elmv, |
| 3946 | int elmc, |
| 3947 | ZoneList<CharacterRange>* ranges) { |
| 3948 | for (int i = 0; i < elmc; i += 2) { |
| 3949 | ASSERT(elmv[i] <= elmv[i + 1]); |
| 3950 | ranges->Add(CharacterRange(elmv[i], elmv[i + 1])); |
| 3951 | } |
| 3952 | } |
| 3953 | |
| 3954 | |
| 3955 | static void AddClassNegated(const uc16 *elmv, |
| 3956 | int elmc, |
| 3957 | ZoneList<CharacterRange>* ranges) { |
| 3958 | ASSERT(elmv[0] != 0x0000); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3959 | ASSERT(elmv[elmc-1] != String::kMaxUC16CharCode); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3960 | uc16 last = 0x0000; |
| 3961 | for (int i = 0; i < elmc; i += 2) { |
| 3962 | ASSERT(last <= elmv[i] - 1); |
| 3963 | ASSERT(elmv[i] <= elmv[i + 1]); |
| 3964 | ranges->Add(CharacterRange(last, elmv[i] - 1)); |
| 3965 | last = elmv[i + 1] + 1; |
| 3966 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 3967 | ranges->Add(CharacterRange(last, String::kMaxUC16CharCode)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3968 | } |
| 3969 | |
| 3970 | |
| 3971 | void CharacterRange::AddClassEscape(uc16 type, |
| 3972 | ZoneList<CharacterRange>* ranges) { |
| 3973 | switch (type) { |
| 3974 | case 's': |
| 3975 | AddClass(kSpaceRanges, kSpaceRangeCount, ranges); |
| 3976 | break; |
| 3977 | case 'S': |
| 3978 | AddClassNegated(kSpaceRanges, kSpaceRangeCount, ranges); |
| 3979 | break; |
| 3980 | case 'w': |
| 3981 | AddClass(kWordRanges, kWordRangeCount, ranges); |
| 3982 | break; |
| 3983 | case 'W': |
| 3984 | AddClassNegated(kWordRanges, kWordRangeCount, ranges); |
| 3985 | break; |
| 3986 | case 'd': |
| 3987 | AddClass(kDigitRanges, kDigitRangeCount, ranges); |
| 3988 | break; |
| 3989 | case 'D': |
| 3990 | AddClassNegated(kDigitRanges, kDigitRangeCount, ranges); |
| 3991 | break; |
| 3992 | case '.': |
| 3993 | AddClassNegated(kLineTerminatorRanges, |
| 3994 | kLineTerminatorRangeCount, |
| 3995 | ranges); |
| 3996 | break; |
| 3997 | // This is not a character range as defined by the spec but a |
| 3998 | // convenient shorthand for a character class that matches any |
| 3999 | // character. |
| 4000 | case '*': |
| 4001 | ranges->Add(CharacterRange::Everything()); |
| 4002 | break; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4003 | // This is the set of characters matched by the $ and ^ symbols |
| 4004 | // in multiline mode. |
| 4005 | case 'n': |
| 4006 | AddClass(kLineTerminatorRanges, |
| 4007 | kLineTerminatorRangeCount, |
| 4008 | ranges); |
| 4009 | break; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4010 | default: |
| 4011 | UNREACHABLE(); |
| 4012 | } |
| 4013 | } |
| 4014 | |
| 4015 | |
| 4016 | Vector<const uc16> CharacterRange::GetWordBounds() { |
| 4017 | return Vector<const uc16>(kWordRanges, kWordRangeCount); |
| 4018 | } |
| 4019 | |
| 4020 | |
| 4021 | class CharacterRangeSplitter { |
| 4022 | public: |
| 4023 | CharacterRangeSplitter(ZoneList<CharacterRange>** included, |
| 4024 | ZoneList<CharacterRange>** excluded) |
| 4025 | : included_(included), |
| 4026 | excluded_(excluded) { } |
| 4027 | void Call(uc16 from, DispatchTable::Entry entry); |
| 4028 | |
| 4029 | static const int kInBase = 0; |
| 4030 | static const int kInOverlay = 1; |
| 4031 | |
| 4032 | private: |
| 4033 | ZoneList<CharacterRange>** included_; |
| 4034 | ZoneList<CharacterRange>** excluded_; |
| 4035 | }; |
| 4036 | |
| 4037 | |
| 4038 | void CharacterRangeSplitter::Call(uc16 from, DispatchTable::Entry entry) { |
| 4039 | if (!entry.out_set()->Get(kInBase)) return; |
| 4040 | ZoneList<CharacterRange>** target = entry.out_set()->Get(kInOverlay) |
| 4041 | ? included_ |
| 4042 | : excluded_; |
| 4043 | if (*target == NULL) *target = new ZoneList<CharacterRange>(2); |
| 4044 | (*target)->Add(CharacterRange(entry.from(), entry.to())); |
| 4045 | } |
| 4046 | |
| 4047 | |
| 4048 | void CharacterRange::Split(ZoneList<CharacterRange>* base, |
| 4049 | Vector<const uc16> overlay, |
| 4050 | ZoneList<CharacterRange>** included, |
| 4051 | ZoneList<CharacterRange>** excluded) { |
| 4052 | ASSERT_EQ(NULL, *included); |
| 4053 | ASSERT_EQ(NULL, *excluded); |
| 4054 | DispatchTable table; |
| 4055 | for (int i = 0; i < base->length(); i++) |
| 4056 | table.AddRange(base->at(i), CharacterRangeSplitter::kInBase); |
| 4057 | for (int i = 0; i < overlay.length(); i += 2) { |
| 4058 | table.AddRange(CharacterRange(overlay[i], overlay[i+1]), |
| 4059 | CharacterRangeSplitter::kInOverlay); |
| 4060 | } |
| 4061 | CharacterRangeSplitter callback(included, excluded); |
| 4062 | table.ForEach(&callback); |
| 4063 | } |
| 4064 | |
| 4065 | |
| 4066 | void CharacterRange::AddCaseEquivalents(ZoneList<CharacterRange>* ranges) { |
| 4067 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 4068 | if (IsSingleton()) { |
| 4069 | // If this is a singleton we just expand the one character. |
| 4070 | int length = uncanonicalize.get(from(), '\0', chars); |
| 4071 | for (int i = 0; i < length; i++) { |
| 4072 | uc32 chr = chars[i]; |
| 4073 | if (chr != from()) { |
| 4074 | ranges->Add(CharacterRange::Singleton(chars[i])); |
| 4075 | } |
| 4076 | } |
| 4077 | } else if (from() <= kRangeCanonicalizeMax && |
| 4078 | to() <= kRangeCanonicalizeMax) { |
| 4079 | // If this is a range we expand the characters block by block, |
| 4080 | // expanding contiguous subranges (blocks) one at a time. |
| 4081 | // The approach is as follows. For a given start character we |
| 4082 | // look up the block that contains it, for instance 'a' if the |
| 4083 | // start character is 'c'. A block is characterized by the property |
| 4084 | // that all characters uncanonicalize in the same way as the first |
| 4085 | // element, except that each entry in the result is incremented |
| 4086 | // by the distance from the first element. So a-z is a block |
| 4087 | // because 'a' uncanonicalizes to ['a', 'A'] and the k'th letter |
| 4088 | // uncanonicalizes to ['a' + k, 'A' + k]. |
| 4089 | // Once we've found the start point we look up its uncanonicalization |
| 4090 | // and produce a range for each element. For instance for [c-f] |
| 4091 | // we look up ['a', 'A'] and produce [c-f] and [C-F]. We then only |
| 4092 | // add a range if it is not already contained in the input, so [c-f] |
| 4093 | // will be skipped but [C-F] will be added. If this range is not |
| 4094 | // completely contained in a block we do this for all the blocks |
| 4095 | // covered by the range. |
| 4096 | unibrow::uchar range[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 4097 | // First, look up the block that contains the 'from' character. |
| 4098 | int length = canonrange.get(from(), '\0', range); |
| 4099 | if (length == 0) { |
| 4100 | range[0] = from(); |
| 4101 | } else { |
| 4102 | ASSERT_EQ(1, length); |
| 4103 | } |
| 4104 | int pos = from(); |
| 4105 | // The start of the current block. Note that except for the first |
| 4106 | // iteration 'start' is always equal to 'pos'. |
| 4107 | int start; |
| 4108 | // If it is not the start point of a block the entry contains the |
| 4109 | // offset of the character from the start point. |
| 4110 | if ((range[0] & kStartMarker) == 0) { |
| 4111 | start = pos - range[0]; |
| 4112 | } else { |
| 4113 | start = pos; |
| 4114 | } |
| 4115 | // Then we add the ranges on at a time, incrementing the current |
| 4116 | // position to be after the last block each time. The position |
| 4117 | // always points to the start of a block. |
| 4118 | while (pos < to()) { |
| 4119 | length = canonrange.get(start, '\0', range); |
| 4120 | if (length == 0) { |
| 4121 | range[0] = start; |
| 4122 | } else { |
| 4123 | ASSERT_EQ(1, length); |
| 4124 | } |
| 4125 | ASSERT((range[0] & kStartMarker) != 0); |
| 4126 | // The start point of a block contains the distance to the end |
| 4127 | // of the range. |
| 4128 | int block_end = start + (range[0] & kPayloadMask) - 1; |
| 4129 | int end = (block_end > to()) ? to() : block_end; |
| 4130 | length = uncanonicalize.get(start, '\0', range); |
| 4131 | for (int i = 0; i < length; i++) { |
| 4132 | uc32 c = range[i]; |
| 4133 | uc16 range_from = c + (pos - start); |
| 4134 | uc16 range_to = c + (end - start); |
| 4135 | if (!(from() <= range_from && range_to <= to())) { |
| 4136 | ranges->Add(CharacterRange(range_from, range_to)); |
| 4137 | } |
| 4138 | } |
| 4139 | start = pos = block_end + 1; |
| 4140 | } |
| 4141 | } else { |
| 4142 | // TODO(plesner) when we've fixed the 2^11 bug in unibrow. |
| 4143 | } |
| 4144 | } |
| 4145 | |
| 4146 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4147 | ZoneList<CharacterRange>* CharacterSet::ranges() { |
| 4148 | if (ranges_ == NULL) { |
| 4149 | ranges_ = new ZoneList<CharacterRange>(2); |
| 4150 | CharacterRange::AddClassEscape(standard_set_type_, ranges_); |
| 4151 | } |
| 4152 | return ranges_; |
| 4153 | } |
| 4154 | |
| 4155 | |
| 4156 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4157 | // ------------------------------------------------------------------- |
| 4158 | // Interest propagation |
| 4159 | |
| 4160 | |
| 4161 | RegExpNode* RegExpNode::TryGetSibling(NodeInfo* info) { |
| 4162 | for (int i = 0; i < siblings_.length(); i++) { |
| 4163 | RegExpNode* sibling = siblings_.Get(i); |
| 4164 | if (sibling->info()->Matches(info)) |
| 4165 | return sibling; |
| 4166 | } |
| 4167 | return NULL; |
| 4168 | } |
| 4169 | |
| 4170 | |
| 4171 | RegExpNode* RegExpNode::EnsureSibling(NodeInfo* info, bool* cloned) { |
| 4172 | ASSERT_EQ(false, *cloned); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4173 | siblings_.Ensure(this); |
| 4174 | RegExpNode* result = TryGetSibling(info); |
| 4175 | if (result != NULL) return result; |
| 4176 | result = this->Clone(); |
| 4177 | NodeInfo* new_info = result->info(); |
| 4178 | new_info->ResetCompilationState(); |
| 4179 | new_info->AddFromPreceding(info); |
| 4180 | AddSibling(result); |
| 4181 | *cloned = true; |
| 4182 | return result; |
| 4183 | } |
| 4184 | |
| 4185 | |
| 4186 | template <class C> |
| 4187 | static RegExpNode* PropagateToEndpoint(C* node, NodeInfo* info) { |
| 4188 | NodeInfo full_info(*node->info()); |
| 4189 | full_info.AddFromPreceding(info); |
| 4190 | bool cloned = false; |
| 4191 | return RegExpNode::EnsureSibling(node, &full_info, &cloned); |
| 4192 | } |
| 4193 | |
| 4194 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4195 | // ------------------------------------------------------------------- |
| 4196 | // Splay tree |
| 4197 | |
| 4198 | |
| 4199 | OutSet* OutSet::Extend(unsigned value) { |
| 4200 | if (Get(value)) |
| 4201 | return this; |
| 4202 | if (successors() != NULL) { |
| 4203 | for (int i = 0; i < successors()->length(); i++) { |
| 4204 | OutSet* successor = successors()->at(i); |
| 4205 | if (successor->Get(value)) |
| 4206 | return successor; |
| 4207 | } |
| 4208 | } else { |
| 4209 | successors_ = new ZoneList<OutSet*>(2); |
| 4210 | } |
| 4211 | OutSet* result = new OutSet(first_, remaining_); |
| 4212 | result->Set(value); |
| 4213 | successors()->Add(result); |
| 4214 | return result; |
| 4215 | } |
| 4216 | |
| 4217 | |
| 4218 | void OutSet::Set(unsigned value) { |
| 4219 | if (value < kFirstLimit) { |
| 4220 | first_ |= (1 << value); |
| 4221 | } else { |
| 4222 | if (remaining_ == NULL) |
| 4223 | remaining_ = new ZoneList<unsigned>(1); |
| 4224 | if (remaining_->is_empty() || !remaining_->Contains(value)) |
| 4225 | remaining_->Add(value); |
| 4226 | } |
| 4227 | } |
| 4228 | |
| 4229 | |
| 4230 | bool OutSet::Get(unsigned value) { |
| 4231 | if (value < kFirstLimit) { |
| 4232 | return (first_ & (1 << value)) != 0; |
| 4233 | } else if (remaining_ == NULL) { |
| 4234 | return false; |
| 4235 | } else { |
| 4236 | return remaining_->Contains(value); |
| 4237 | } |
| 4238 | } |
| 4239 | |
| 4240 | |
| 4241 | const uc16 DispatchTable::Config::kNoKey = unibrow::Utf8::kBadChar; |
| 4242 | const DispatchTable::Entry DispatchTable::Config::kNoValue; |
| 4243 | |
| 4244 | |
| 4245 | void DispatchTable::AddRange(CharacterRange full_range, int value) { |
| 4246 | CharacterRange current = full_range; |
| 4247 | if (tree()->is_empty()) { |
| 4248 | // If this is the first range we just insert into the table. |
| 4249 | ZoneSplayTree<Config>::Locator loc; |
| 4250 | ASSERT_RESULT(tree()->Insert(current.from(), &loc)); |
| 4251 | loc.set_value(Entry(current.from(), current.to(), empty()->Extend(value))); |
| 4252 | return; |
| 4253 | } |
| 4254 | // First see if there is a range to the left of this one that |
| 4255 | // overlaps. |
| 4256 | ZoneSplayTree<Config>::Locator loc; |
| 4257 | if (tree()->FindGreatestLessThan(current.from(), &loc)) { |
| 4258 | Entry* entry = &loc.value(); |
| 4259 | // If we've found a range that overlaps with this one, and it |
| 4260 | // starts strictly to the left of this one, we have to fix it |
| 4261 | // because the following code only handles ranges that start on |
| 4262 | // or after the start point of the range we're adding. |
| 4263 | if (entry->from() < current.from() && entry->to() >= current.from()) { |
| 4264 | // Snap the overlapping range in half around the start point of |
| 4265 | // the range we're adding. |
| 4266 | CharacterRange left(entry->from(), current.from() - 1); |
| 4267 | CharacterRange right(current.from(), entry->to()); |
| 4268 | // The left part of the overlapping range doesn't overlap. |
| 4269 | // Truncate the whole entry to be just the left part. |
| 4270 | entry->set_to(left.to()); |
| 4271 | // The right part is the one that overlaps. We add this part |
| 4272 | // to the map and let the next step deal with merging it with |
| 4273 | // the range we're adding. |
| 4274 | ZoneSplayTree<Config>::Locator loc; |
| 4275 | ASSERT_RESULT(tree()->Insert(right.from(), &loc)); |
| 4276 | loc.set_value(Entry(right.from(), |
| 4277 | right.to(), |
| 4278 | entry->out_set())); |
| 4279 | } |
| 4280 | } |
| 4281 | while (current.is_valid()) { |
| 4282 | if (tree()->FindLeastGreaterThan(current.from(), &loc) && |
| 4283 | (loc.value().from() <= current.to()) && |
| 4284 | (loc.value().to() >= current.from())) { |
| 4285 | Entry* entry = &loc.value(); |
| 4286 | // We have overlap. If there is space between the start point of |
| 4287 | // the range we're adding and where the overlapping range starts |
| 4288 | // then we have to add a range covering just that space. |
| 4289 | if (current.from() < entry->from()) { |
| 4290 | ZoneSplayTree<Config>::Locator ins; |
| 4291 | ASSERT_RESULT(tree()->Insert(current.from(), &ins)); |
| 4292 | ins.set_value(Entry(current.from(), |
| 4293 | entry->from() - 1, |
| 4294 | empty()->Extend(value))); |
| 4295 | current.set_from(entry->from()); |
| 4296 | } |
| 4297 | ASSERT_EQ(current.from(), entry->from()); |
| 4298 | // If the overlapping range extends beyond the one we want to add |
| 4299 | // we have to snap the right part off and add it separately. |
| 4300 | if (entry->to() > current.to()) { |
| 4301 | ZoneSplayTree<Config>::Locator ins; |
| 4302 | ASSERT_RESULT(tree()->Insert(current.to() + 1, &ins)); |
| 4303 | ins.set_value(Entry(current.to() + 1, |
| 4304 | entry->to(), |
| 4305 | entry->out_set())); |
| 4306 | entry->set_to(current.to()); |
| 4307 | } |
| 4308 | ASSERT(entry->to() <= current.to()); |
| 4309 | // The overlapping range is now completely contained by the range |
| 4310 | // we're adding so we can just update it and move the start point |
| 4311 | // of the range we're adding just past it. |
| 4312 | entry->AddValue(value); |
| 4313 | // Bail out if the last interval ended at 0xFFFF since otherwise |
| 4314 | // adding 1 will wrap around to 0. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4315 | if (entry->to() == String::kMaxUC16CharCode) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4316 | break; |
| 4317 | ASSERT(entry->to() + 1 > current.from()); |
| 4318 | current.set_from(entry->to() + 1); |
| 4319 | } else { |
| 4320 | // There is no overlap so we can just add the range |
| 4321 | ZoneSplayTree<Config>::Locator ins; |
| 4322 | ASSERT_RESULT(tree()->Insert(current.from(), &ins)); |
| 4323 | ins.set_value(Entry(current.from(), |
| 4324 | current.to(), |
| 4325 | empty()->Extend(value))); |
| 4326 | break; |
| 4327 | } |
| 4328 | } |
| 4329 | } |
| 4330 | |
| 4331 | |
| 4332 | OutSet* DispatchTable::Get(uc16 value) { |
| 4333 | ZoneSplayTree<Config>::Locator loc; |
| 4334 | if (!tree()->FindGreatestLessThan(value, &loc)) |
| 4335 | return empty(); |
| 4336 | Entry* entry = &loc.value(); |
| 4337 | if (value <= entry->to()) |
| 4338 | return entry->out_set(); |
| 4339 | else |
| 4340 | return empty(); |
| 4341 | } |
| 4342 | |
| 4343 | |
| 4344 | // ------------------------------------------------------------------- |
| 4345 | // Analysis |
| 4346 | |
| 4347 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4348 | void Analysis::EnsureAnalyzed(RegExpNode* that) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4349 | if (that->info()->been_analyzed || that->info()->being_analyzed) |
| 4350 | return; |
| 4351 | that->info()->being_analyzed = true; |
| 4352 | that->Accept(this); |
| 4353 | that->info()->being_analyzed = false; |
| 4354 | that->info()->been_analyzed = true; |
| 4355 | } |
| 4356 | |
| 4357 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4358 | void Analysis::VisitEnd(EndNode* that) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4359 | // nothing to do |
| 4360 | } |
| 4361 | |
| 4362 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4363 | void TextNode::CalculateOffsets() { |
| 4364 | int element_count = elements()->length(); |
| 4365 | // Set up the offsets of the elements relative to the start. This is a fixed |
| 4366 | // quantity since a TextNode can only contain fixed-width things. |
| 4367 | int cp_offset = 0; |
| 4368 | for (int i = 0; i < element_count; i++) { |
| 4369 | TextElement& elm = elements()->at(i); |
| 4370 | elm.cp_offset = cp_offset; |
| 4371 | if (elm.type == TextElement::ATOM) { |
| 4372 | cp_offset += elm.data.u_atom->data().length(); |
| 4373 | } else { |
| 4374 | cp_offset++; |
| 4375 | Vector<const uc16> quarks = elm.data.u_atom->data(); |
| 4376 | } |
| 4377 | } |
| 4378 | } |
| 4379 | |
| 4380 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4381 | void Analysis::VisitText(TextNode* that) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4382 | if (ignore_case_) { |
| 4383 | that->MakeCaseIndependent(); |
| 4384 | } |
| 4385 | EnsureAnalyzed(that->on_success()); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4386 | that->CalculateOffsets(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4387 | } |
| 4388 | |
| 4389 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4390 | void Analysis::VisitAction(ActionNode* that) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4391 | RegExpNode* target = that->on_success(); |
| 4392 | EnsureAnalyzed(target); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4393 | // If the next node is interested in what it follows then this node |
| 4394 | // has to be interested too so it can pass the information on. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4395 | that->info()->AddFromFollowing(target->info()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4396 | } |
| 4397 | |
| 4398 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4399 | void Analysis::VisitChoice(ChoiceNode* that) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4400 | NodeInfo* info = that->info(); |
| 4401 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 4402 | RegExpNode* node = that->alternatives()->at(i).node(); |
| 4403 | EnsureAnalyzed(node); |
| 4404 | // Anything the following nodes need to know has to be known by |
| 4405 | // this node also, so it can pass it on. |
| 4406 | info->AddFromFollowing(node->info()); |
| 4407 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4408 | } |
| 4409 | |
| 4410 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4411 | void Analysis::VisitLoopChoice(LoopChoiceNode* that) { |
| 4412 | NodeInfo* info = that->info(); |
| 4413 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 4414 | RegExpNode* node = that->alternatives()->at(i).node(); |
| 4415 | if (node != that->loop_node()) { |
| 4416 | EnsureAnalyzed(node); |
| 4417 | info->AddFromFollowing(node->info()); |
| 4418 | } |
| 4419 | } |
| 4420 | // Check the loop last since it may need the value of this node |
| 4421 | // to get a correct result. |
| 4422 | EnsureAnalyzed(that->loop_node()); |
| 4423 | info->AddFromFollowing(that->loop_node()->info()); |
| 4424 | } |
| 4425 | |
| 4426 | |
| 4427 | void Analysis::VisitBackReference(BackReferenceNode* that) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4428 | EnsureAnalyzed(that->on_success()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4429 | } |
| 4430 | |
| 4431 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4432 | void Analysis::VisitAssertion(AssertionNode* that) { |
| 4433 | EnsureAnalyzed(that->on_success()); |
| 4434 | } |
| 4435 | |
| 4436 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4437 | // ------------------------------------------------------------------- |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4438 | // Dispatch table construction |
| 4439 | |
| 4440 | |
| 4441 | void DispatchTableConstructor::VisitEnd(EndNode* that) { |
| 4442 | AddRange(CharacterRange::Everything()); |
| 4443 | } |
| 4444 | |
| 4445 | |
| 4446 | void DispatchTableConstructor::BuildTable(ChoiceNode* node) { |
| 4447 | node->set_being_calculated(true); |
| 4448 | ZoneList<GuardedAlternative>* alternatives = node->alternatives(); |
| 4449 | for (int i = 0; i < alternatives->length(); i++) { |
| 4450 | set_choice_index(i); |
| 4451 | alternatives->at(i).node()->Accept(this); |
| 4452 | } |
| 4453 | node->set_being_calculated(false); |
| 4454 | } |
| 4455 | |
| 4456 | |
| 4457 | class AddDispatchRange { |
| 4458 | public: |
| 4459 | explicit AddDispatchRange(DispatchTableConstructor* constructor) |
| 4460 | : constructor_(constructor) { } |
| 4461 | void Call(uc32 from, DispatchTable::Entry entry); |
| 4462 | private: |
| 4463 | DispatchTableConstructor* constructor_; |
| 4464 | }; |
| 4465 | |
| 4466 | |
| 4467 | void AddDispatchRange::Call(uc32 from, DispatchTable::Entry entry) { |
| 4468 | CharacterRange range(from, entry.to()); |
| 4469 | constructor_->AddRange(range); |
| 4470 | } |
| 4471 | |
| 4472 | |
| 4473 | void DispatchTableConstructor::VisitChoice(ChoiceNode* node) { |
| 4474 | if (node->being_calculated()) |
| 4475 | return; |
| 4476 | DispatchTable* table = node->GetTable(ignore_case_); |
| 4477 | AddDispatchRange adder(this); |
| 4478 | table->ForEach(&adder); |
| 4479 | } |
| 4480 | |
| 4481 | |
| 4482 | void DispatchTableConstructor::VisitBackReference(BackReferenceNode* that) { |
| 4483 | // TODO(160): Find the node that we refer back to and propagate its start |
| 4484 | // set back to here. For now we just accept anything. |
| 4485 | AddRange(CharacterRange::Everything()); |
| 4486 | } |
| 4487 | |
| 4488 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4489 | void DispatchTableConstructor::VisitAssertion(AssertionNode* that) { |
| 4490 | RegExpNode* target = that->on_success(); |
| 4491 | target->Accept(this); |
| 4492 | } |
| 4493 | |
| 4494 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4495 | |
| 4496 | static int CompareRangeByFrom(const CharacterRange* a, |
| 4497 | const CharacterRange* b) { |
| 4498 | return Compare<uc16>(a->from(), b->from()); |
| 4499 | } |
| 4500 | |
| 4501 | |
| 4502 | void DispatchTableConstructor::AddInverse(ZoneList<CharacterRange>* ranges) { |
| 4503 | ranges->Sort(CompareRangeByFrom); |
| 4504 | uc16 last = 0; |
| 4505 | for (int i = 0; i < ranges->length(); i++) { |
| 4506 | CharacterRange range = ranges->at(i); |
| 4507 | if (last < range.from()) |
| 4508 | AddRange(CharacterRange(last, range.from() - 1)); |
| 4509 | if (range.to() >= last) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4510 | if (range.to() == String::kMaxUC16CharCode) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4511 | return; |
| 4512 | } else { |
| 4513 | last = range.to() + 1; |
| 4514 | } |
| 4515 | } |
| 4516 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4517 | AddRange(CharacterRange(last, String::kMaxUC16CharCode)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4518 | } |
| 4519 | |
| 4520 | |
| 4521 | void DispatchTableConstructor::VisitText(TextNode* that) { |
| 4522 | TextElement elm = that->elements()->at(0); |
| 4523 | switch (elm.type) { |
| 4524 | case TextElement::ATOM: { |
| 4525 | uc16 c = elm.data.u_atom->data()[0]; |
| 4526 | AddRange(CharacterRange(c, c)); |
| 4527 | break; |
| 4528 | } |
| 4529 | case TextElement::CHAR_CLASS: { |
| 4530 | RegExpCharacterClass* tree = elm.data.u_char_class; |
| 4531 | ZoneList<CharacterRange>* ranges = tree->ranges(); |
| 4532 | if (tree->is_negated()) { |
| 4533 | AddInverse(ranges); |
| 4534 | } else { |
| 4535 | for (int i = 0; i < ranges->length(); i++) |
| 4536 | AddRange(ranges->at(i)); |
| 4537 | } |
| 4538 | break; |
| 4539 | } |
| 4540 | default: { |
| 4541 | UNIMPLEMENTED(); |
| 4542 | } |
| 4543 | } |
| 4544 | } |
| 4545 | |
| 4546 | |
| 4547 | void DispatchTableConstructor::VisitAction(ActionNode* that) { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4548 | RegExpNode* target = that->on_success(); |
| 4549 | target->Accept(this); |
| 4550 | } |
| 4551 | |
| 4552 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 4553 | RegExpEngine::CompilationResult RegExpEngine::Compile(RegExpCompileData* data, |
| 4554 | bool ignore_case, |
| 4555 | bool is_multiline, |
| 4556 | Handle<String> pattern, |
| 4557 | bool is_ascii) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4558 | if ((data->capture_count + 1) * 2 - 1 > RegExpMacroAssembler::kMaxRegister) { |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 4559 | return IrregexpRegExpTooBig(); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4560 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4561 | RegExpCompiler compiler(data->capture_count, ignore_case, is_ascii); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4562 | // Wrap the body of the regexp in capture #0. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4563 | RegExpNode* captured_body = RegExpCapture::ToNode(data->tree, |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4564 | 0, |
| 4565 | &compiler, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4566 | compiler.accept()); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4567 | RegExpNode* node = captured_body; |
| 4568 | if (!data->tree->IsAnchored()) { |
| 4569 | // Add a .*? at the beginning, outside the body capture, unless |
| 4570 | // this expression is anchored at the beginning. |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 4571 | RegExpNode* loop_node = |
| 4572 | RegExpQuantifier::ToNode(0, |
| 4573 | RegExpTree::kInfinity, |
| 4574 | false, |
| 4575 | new RegExpCharacterClass('*'), |
| 4576 | &compiler, |
| 4577 | captured_body, |
| 4578 | data->contains_anchor); |
| 4579 | |
| 4580 | if (data->contains_anchor) { |
| 4581 | // Unroll loop once, to take care of the case that might start |
| 4582 | // at the start of input. |
| 4583 | ChoiceNode* first_step_node = new ChoiceNode(2); |
| 4584 | first_step_node->AddAlternative(GuardedAlternative(captured_body)); |
| 4585 | first_step_node->AddAlternative(GuardedAlternative( |
| 4586 | new TextNode(new RegExpCharacterClass('*'), loop_node))); |
| 4587 | node = first_step_node; |
| 4588 | } else { |
| 4589 | node = loop_node; |
| 4590 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 4591 | } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 4592 | data->node = node; |
| 4593 | Analysis analysis(ignore_case); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4594 | analysis.EnsureAnalyzed(node); |
| 4595 | |
| 4596 | NodeInfo info = *node->info(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4597 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 4598 | if (RegExpImpl::UseNativeRegexp()) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4599 | #ifdef ARM |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame^] | 4600 | UNREACHABLE(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4601 | #else // IA32 |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4602 | RegExpMacroAssemblerIA32::Mode mode; |
| 4603 | if (is_ascii) { |
| 4604 | mode = RegExpMacroAssemblerIA32::ASCII; |
| 4605 | } else { |
| 4606 | mode = RegExpMacroAssemblerIA32::UC16; |
| 4607 | } |
| 4608 | RegExpMacroAssemblerIA32 macro_assembler(mode, |
| 4609 | (data->capture_count + 1) * 2); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4610 | return compiler.Assemble(¯o_assembler, |
| 4611 | node, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4612 | data->capture_count, |
| 4613 | pattern); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4614 | #endif |
| 4615 | } |
| 4616 | EmbeddedVector<byte, 1024> codes; |
| 4617 | RegExpMacroAssemblerIrregexp macro_assembler(codes); |
| 4618 | return compiler.Assemble(¯o_assembler, |
| 4619 | node, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 4620 | data->capture_count, |
| 4621 | pattern); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 4622 | } |
| 4623 | |
| 4624 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4625 | }} // namespace v8::internal |