Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +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 | |
| 30 | #include "api.h" |
| 31 | #include "ast.h" |
| 32 | #include "bootstrapper.h" |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 33 | #include "codegen.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 34 | #include "compiler.h" |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 35 | #include "func-name-inferrer.h" |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 36 | #include "messages.h" |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 37 | #include "parser.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 38 | #include "platform.h" |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 39 | #include "preparser.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 40 | #include "runtime.h" |
Ben Murdoch | 3bec4d2 | 2010-07-22 14:51:16 +0100 | [diff] [blame] | 41 | #include "scopeinfo.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 42 | #include "string-stream.h" |
| 43 | |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 44 | #include "ast-inl.h" |
| 45 | #include "jump-target-inl.h" |
| 46 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 47 | namespace v8 { |
| 48 | namespace internal { |
| 49 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 50 | // PositionStack is used for on-stack allocation of token positions for |
| 51 | // new expressions. Please look at ParseNewExpression. |
| 52 | |
| 53 | class PositionStack { |
| 54 | public: |
| 55 | explicit PositionStack(bool* ok) : top_(NULL), ok_(ok) {} |
| 56 | ~PositionStack() { ASSERT(!*ok_ || is_empty()); } |
| 57 | |
| 58 | class Element { |
| 59 | public: |
| 60 | Element(PositionStack* stack, int value) { |
| 61 | previous_ = stack->top(); |
| 62 | value_ = value; |
| 63 | stack->set_top(this); |
| 64 | } |
| 65 | |
| 66 | private: |
| 67 | Element* previous() { return previous_; } |
| 68 | int value() { return value_; } |
| 69 | friend class PositionStack; |
| 70 | Element* previous_; |
| 71 | int value_; |
| 72 | }; |
| 73 | |
| 74 | bool is_empty() { return top_ == NULL; } |
| 75 | int pop() { |
| 76 | ASSERT(!is_empty()); |
| 77 | int result = top_->value(); |
| 78 | top_ = top_->previous(); |
| 79 | return result; |
| 80 | } |
| 81 | |
| 82 | private: |
| 83 | Element* top() { return top_; } |
| 84 | void set_top(Element* value) { top_ = value; } |
| 85 | Element* top_; |
| 86 | bool* ok_; |
| 87 | }; |
| 88 | |
| 89 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 90 | RegExpBuilder::RegExpBuilder() |
| 91 | : pending_empty_(false), |
| 92 | characters_(NULL), |
| 93 | terms_(), |
| 94 | alternatives_() |
| 95 | #ifdef DEBUG |
| 96 | , last_added_(ADD_NONE) |
| 97 | #endif |
| 98 | {} |
| 99 | |
| 100 | |
| 101 | void RegExpBuilder::FlushCharacters() { |
| 102 | pending_empty_ = false; |
| 103 | if (characters_ != NULL) { |
| 104 | RegExpTree* atom = new RegExpAtom(characters_->ToConstVector()); |
| 105 | characters_ = NULL; |
| 106 | text_.Add(atom); |
| 107 | LAST(ADD_ATOM); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | |
| 112 | void RegExpBuilder::FlushText() { |
| 113 | FlushCharacters(); |
| 114 | int num_text = text_.length(); |
| 115 | if (num_text == 0) { |
| 116 | return; |
| 117 | } else if (num_text == 1) { |
| 118 | terms_.Add(text_.last()); |
| 119 | } else { |
| 120 | RegExpText* text = new RegExpText(); |
| 121 | for (int i = 0; i < num_text; i++) |
| 122 | text_.Get(i)->AppendToText(text); |
| 123 | terms_.Add(text); |
| 124 | } |
| 125 | text_.Clear(); |
| 126 | } |
| 127 | |
| 128 | |
| 129 | void RegExpBuilder::AddCharacter(uc16 c) { |
| 130 | pending_empty_ = false; |
| 131 | if (characters_ == NULL) { |
| 132 | characters_ = new ZoneList<uc16>(4); |
| 133 | } |
| 134 | characters_->Add(c); |
| 135 | LAST(ADD_CHAR); |
| 136 | } |
| 137 | |
| 138 | |
| 139 | void RegExpBuilder::AddEmpty() { |
| 140 | pending_empty_ = true; |
| 141 | } |
| 142 | |
| 143 | |
| 144 | void RegExpBuilder::AddAtom(RegExpTree* term) { |
| 145 | if (term->IsEmpty()) { |
| 146 | AddEmpty(); |
| 147 | return; |
| 148 | } |
| 149 | if (term->IsTextElement()) { |
| 150 | FlushCharacters(); |
| 151 | text_.Add(term); |
| 152 | } else { |
| 153 | FlushText(); |
| 154 | terms_.Add(term); |
| 155 | } |
| 156 | LAST(ADD_ATOM); |
| 157 | } |
| 158 | |
| 159 | |
| 160 | void RegExpBuilder::AddAssertion(RegExpTree* assert) { |
| 161 | FlushText(); |
| 162 | terms_.Add(assert); |
| 163 | LAST(ADD_ASSERT); |
| 164 | } |
| 165 | |
| 166 | |
| 167 | void RegExpBuilder::NewAlternative() { |
| 168 | FlushTerms(); |
| 169 | } |
| 170 | |
| 171 | |
| 172 | void RegExpBuilder::FlushTerms() { |
| 173 | FlushText(); |
| 174 | int num_terms = terms_.length(); |
| 175 | RegExpTree* alternative; |
| 176 | if (num_terms == 0) { |
| 177 | alternative = RegExpEmpty::GetInstance(); |
| 178 | } else if (num_terms == 1) { |
| 179 | alternative = terms_.last(); |
| 180 | } else { |
| 181 | alternative = new RegExpAlternative(terms_.GetList()); |
| 182 | } |
| 183 | alternatives_.Add(alternative); |
| 184 | terms_.Clear(); |
| 185 | LAST(ADD_NONE); |
| 186 | } |
| 187 | |
| 188 | |
| 189 | RegExpTree* RegExpBuilder::ToRegExp() { |
| 190 | FlushTerms(); |
| 191 | int num_alternatives = alternatives_.length(); |
| 192 | if (num_alternatives == 0) { |
| 193 | return RegExpEmpty::GetInstance(); |
| 194 | } |
| 195 | if (num_alternatives == 1) { |
| 196 | return alternatives_.last(); |
| 197 | } |
| 198 | return new RegExpDisjunction(alternatives_.GetList()); |
| 199 | } |
| 200 | |
| 201 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 202 | void RegExpBuilder::AddQuantifierToAtom(int min, |
| 203 | int max, |
| 204 | RegExpQuantifier::Type type) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 205 | if (pending_empty_) { |
| 206 | pending_empty_ = false; |
| 207 | return; |
| 208 | } |
| 209 | RegExpTree* atom; |
| 210 | if (characters_ != NULL) { |
| 211 | ASSERT(last_added_ == ADD_CHAR); |
| 212 | // Last atom was character. |
| 213 | Vector<const uc16> char_vector = characters_->ToConstVector(); |
| 214 | int num_chars = char_vector.length(); |
| 215 | if (num_chars > 1) { |
| 216 | Vector<const uc16> prefix = char_vector.SubVector(0, num_chars - 1); |
| 217 | text_.Add(new RegExpAtom(prefix)); |
| 218 | char_vector = char_vector.SubVector(num_chars - 1, num_chars); |
| 219 | } |
| 220 | characters_ = NULL; |
| 221 | atom = new RegExpAtom(char_vector); |
| 222 | FlushText(); |
| 223 | } else if (text_.length() > 0) { |
| 224 | ASSERT(last_added_ == ADD_ATOM); |
| 225 | atom = text_.RemoveLast(); |
| 226 | FlushText(); |
| 227 | } else if (terms_.length() > 0) { |
| 228 | ASSERT(last_added_ == ADD_ATOM); |
| 229 | atom = terms_.RemoveLast(); |
| 230 | if (atom->max_match() == 0) { |
| 231 | // Guaranteed to only match an empty string. |
| 232 | LAST(ADD_TERM); |
| 233 | if (min == 0) { |
| 234 | return; |
| 235 | } |
| 236 | terms_.Add(atom); |
| 237 | return; |
| 238 | } |
| 239 | } else { |
| 240 | // Only call immediately after adding an atom or character! |
| 241 | UNREACHABLE(); |
| 242 | return; |
| 243 | } |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 244 | terms_.Add(new RegExpQuantifier(min, max, type, atom)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 245 | LAST(ADD_TERM); |
| 246 | } |
| 247 | |
| 248 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 249 | // A temporary scope stores information during parsing, just like |
| 250 | // a plain scope. However, temporary scopes are not kept around |
| 251 | // after parsing or referenced by syntax trees so they can be stack- |
| 252 | // allocated and hence used by the pre-parser. |
| 253 | class TemporaryScope BASE_EMBEDDED { |
| 254 | public: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 255 | explicit TemporaryScope(TemporaryScope** variable); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 256 | ~TemporaryScope(); |
| 257 | |
| 258 | int NextMaterializedLiteralIndex() { |
| 259 | int next_index = |
| 260 | materialized_literal_count_ + JSFunction::kLiteralsPrefixSize; |
| 261 | materialized_literal_count_++; |
| 262 | return next_index; |
| 263 | } |
| 264 | int materialized_literal_count() { return materialized_literal_count_; } |
| 265 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 266 | void SetThisPropertyAssignmentInfo( |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 267 | bool only_simple_this_property_assignments, |
| 268 | Handle<FixedArray> this_property_assignments) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 269 | only_simple_this_property_assignments_ = |
| 270 | only_simple_this_property_assignments; |
| 271 | this_property_assignments_ = this_property_assignments; |
| 272 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 273 | bool only_simple_this_property_assignments() { |
| 274 | return only_simple_this_property_assignments_; |
| 275 | } |
| 276 | Handle<FixedArray> this_property_assignments() { |
| 277 | return this_property_assignments_; |
| 278 | } |
| 279 | |
| 280 | void AddProperty() { expected_property_count_++; } |
| 281 | int expected_property_count() { return expected_property_count_; } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 282 | |
| 283 | void AddLoop() { loop_count_++; } |
| 284 | bool ContainsLoops() const { return loop_count_ > 0; } |
| 285 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 286 | private: |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 287 | // Captures the number of literals that need materialization in the |
| 288 | // function. Includes regexp literals, and boilerplate for object |
| 289 | // and array literals. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 290 | int materialized_literal_count_; |
| 291 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 292 | // Properties count estimation. |
| 293 | int expected_property_count_; |
| 294 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 295 | // Keeps track of assignments to properties of this. Used for |
| 296 | // optimizing constructors. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 297 | bool only_simple_this_property_assignments_; |
| 298 | Handle<FixedArray> this_property_assignments_; |
| 299 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 300 | // Captures the number of loops inside the scope. |
| 301 | int loop_count_; |
| 302 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 303 | // Bookkeeping |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 304 | TemporaryScope** variable_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 305 | TemporaryScope* parent_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 306 | }; |
| 307 | |
| 308 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 309 | TemporaryScope::TemporaryScope(TemporaryScope** variable) |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 310 | : materialized_literal_count_(0), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 311 | expected_property_count_(0), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 312 | only_simple_this_property_assignments_(false), |
| 313 | this_property_assignments_(Factory::empty_fixed_array()), |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 314 | loop_count_(0), |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 315 | variable_(variable), |
| 316 | parent_(*variable) { |
| 317 | *variable = this; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | |
| 321 | TemporaryScope::~TemporaryScope() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 322 | *variable_ = parent_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 326 | Handle<String> Parser::LookupSymbol(int symbol_id) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 327 | // Length of symbol cache is the number of identified symbols. |
| 328 | // If we are larger than that, or negative, it's not a cached symbol. |
| 329 | // This might also happen if there is no preparser symbol data, even |
| 330 | // if there is some preparser data. |
| 331 | if (static_cast<unsigned>(symbol_id) |
| 332 | >= static_cast<unsigned>(symbol_cache_.length())) { |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 333 | if (scanner().is_literal_ascii()) { |
| 334 | return Factory::LookupAsciiSymbol(scanner().literal_ascii_string()); |
| 335 | } else { |
| 336 | return Factory::LookupTwoByteSymbol(scanner().literal_uc16_string()); |
| 337 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 338 | } |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 339 | return LookupCachedSymbol(symbol_id); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 343 | Handle<String> Parser::LookupCachedSymbol(int symbol_id) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 344 | // Make sure the cache is large enough to hold the symbol identifier. |
| 345 | if (symbol_cache_.length() <= symbol_id) { |
| 346 | // Increase length to index + 1. |
| 347 | symbol_cache_.AddBlock(Handle<String>::null(), |
| 348 | symbol_id + 1 - symbol_cache_.length()); |
| 349 | } |
| 350 | Handle<String> result = symbol_cache_.at(symbol_id); |
| 351 | if (result.is_null()) { |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 352 | if (scanner().is_literal_ascii()) { |
| 353 | result = Factory::LookupAsciiSymbol(scanner().literal_ascii_string()); |
| 354 | } else { |
| 355 | result = Factory::LookupTwoByteSymbol(scanner().literal_uc16_string()); |
| 356 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 357 | symbol_cache_.at(symbol_id) = result; |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 358 | return result; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 359 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 360 | Counters::total_preparse_symbols_skipped.Increment(); |
| 361 | return result; |
| 362 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 363 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 364 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 365 | FunctionEntry ScriptDataImpl::GetFunctionEntry(int start) { |
| 366 | // The current pre-data entry must be a FunctionEntry with the given |
| 367 | // start position. |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 368 | if ((function_index_ + FunctionEntry::kSize <= store_.length()) |
| 369 | && (static_cast<int>(store_[function_index_]) == start)) { |
| 370 | int index = function_index_; |
| 371 | function_index_ += FunctionEntry::kSize; |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 372 | return FunctionEntry(store_.SubVector(index, |
| 373 | index + FunctionEntry::kSize)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 374 | } |
| 375 | return FunctionEntry(); |
| 376 | } |
| 377 | |
| 378 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 379 | int ScriptDataImpl::GetSymbolIdentifier() { |
| 380 | return ReadNumber(&symbol_data_); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 384 | bool ScriptDataImpl::SanityCheck() { |
| 385 | // Check that the header data is valid and doesn't specify |
| 386 | // point to positions outside the store. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 387 | if (store_.length() < PreparseDataConstants::kHeaderSize) return false; |
| 388 | if (magic() != PreparseDataConstants::kMagicNumber) return false; |
| 389 | if (version() != PreparseDataConstants::kCurrentVersion) return false; |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 390 | if (has_error()) { |
| 391 | // Extra sane sanity check for error message encoding. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 392 | if (store_.length() <= PreparseDataConstants::kHeaderSize |
| 393 | + PreparseDataConstants::kMessageTextPos) { |
| 394 | return false; |
| 395 | } |
| 396 | if (Read(PreparseDataConstants::kMessageStartPos) > |
| 397 | Read(PreparseDataConstants::kMessageEndPos)) { |
| 398 | return false; |
| 399 | } |
| 400 | unsigned arg_count = Read(PreparseDataConstants::kMessageArgCountPos); |
| 401 | int pos = PreparseDataConstants::kMessageTextPos; |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 402 | for (unsigned int i = 0; i <= arg_count; i++) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 403 | if (store_.length() <= PreparseDataConstants::kHeaderSize + pos) { |
| 404 | return false; |
| 405 | } |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 406 | int length = static_cast<int>(Read(pos)); |
| 407 | if (length < 0) return false; |
| 408 | pos += 1 + length; |
| 409 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 410 | if (store_.length() < PreparseDataConstants::kHeaderSize + pos) { |
| 411 | return false; |
| 412 | } |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 413 | return true; |
| 414 | } |
| 415 | // Check that the space allocated for function entries is sane. |
| 416 | int functions_size = |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 417 | static_cast<int>(store_[PreparseDataConstants::kFunctionsSizeOffset]); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 418 | if (functions_size < 0) return false; |
| 419 | if (functions_size % FunctionEntry::kSize != 0) return false; |
| 420 | // Check that the count of symbols is non-negative. |
| 421 | int symbol_count = |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 422 | static_cast<int>(store_[PreparseDataConstants::kSymbolCountOffset]); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 423 | if (symbol_count < 0) return false; |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 424 | // Check that the total size has room for header and function entries. |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 425 | int minimum_size = |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 426 | PreparseDataConstants::kHeaderSize + functions_size; |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 427 | if (store_.length() < minimum_size) return false; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 428 | return true; |
| 429 | } |
| 430 | |
| 431 | |
Steve Block | 5915150 | 2010-09-22 15:07:15 +0100 | [diff] [blame] | 432 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 433 | const char* ScriptDataImpl::ReadString(unsigned* start, int* chars) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 434 | int length = start[0]; |
| 435 | char* result = NewArray<char>(length + 1); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 436 | for (int i = 0; i < length; i++) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 437 | result[i] = start[i + 1]; |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 438 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 439 | result[length] = '\0'; |
| 440 | if (chars != NULL) *chars = length; |
| 441 | return result; |
| 442 | } |
| 443 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 444 | Scanner::Location ScriptDataImpl::MessageLocation() { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 445 | int beg_pos = Read(PreparseDataConstants::kMessageStartPos); |
| 446 | int end_pos = Read(PreparseDataConstants::kMessageEndPos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 447 | return Scanner::Location(beg_pos, end_pos); |
| 448 | } |
| 449 | |
| 450 | |
| 451 | const char* ScriptDataImpl::BuildMessage() { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 452 | unsigned* start = ReadAddress(PreparseDataConstants::kMessageTextPos); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 453 | return ReadString(start, NULL); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | |
| 457 | Vector<const char*> ScriptDataImpl::BuildArgs() { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 458 | int arg_count = Read(PreparseDataConstants::kMessageArgCountPos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 459 | const char** array = NewArray<const char*>(arg_count); |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 460 | // Position after text found by skipping past length field and |
| 461 | // length field content words. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 462 | int pos = PreparseDataConstants::kMessageTextPos + 1 |
| 463 | + Read(PreparseDataConstants::kMessageTextPos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 464 | for (int i = 0; i < arg_count; i++) { |
| 465 | int count = 0; |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 466 | array[i] = ReadString(ReadAddress(pos), &count); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 467 | pos += count + 1; |
| 468 | } |
| 469 | return Vector<const char*>(array, arg_count); |
| 470 | } |
| 471 | |
| 472 | |
| 473 | unsigned ScriptDataImpl::Read(int position) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 474 | return store_[PreparseDataConstants::kHeaderSize + position]; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | |
| 478 | unsigned* ScriptDataImpl::ReadAddress(int position) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 479 | return &store_[PreparseDataConstants::kHeaderSize + position]; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 483 | Scope* Parser::NewScope(Scope* parent, Scope::Type type, bool inside_with) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 484 | Scope* result = new Scope(parent, type); |
| 485 | result->Initialize(inside_with); |
| 486 | return result; |
| 487 | } |
| 488 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 489 | // ---------------------------------------------------------------------------- |
| 490 | // Target is a support class to facilitate manipulation of the |
| 491 | // Parser's target_stack_ (the stack of potential 'break' and |
| 492 | // 'continue' statement targets). Upon construction, a new target is |
| 493 | // added; it is removed upon destruction. |
| 494 | |
| 495 | class Target BASE_EMBEDDED { |
| 496 | public: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 497 | Target(Target** variable, AstNode* node) |
| 498 | : variable_(variable), node_(node), previous_(*variable) { |
| 499 | *variable = this; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | ~Target() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 503 | *variable_ = previous_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 504 | } |
| 505 | |
| 506 | Target* previous() { return previous_; } |
| 507 | AstNode* node() { return node_; } |
| 508 | |
| 509 | private: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 510 | Target** variable_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 511 | AstNode* node_; |
| 512 | Target* previous_; |
| 513 | }; |
| 514 | |
| 515 | |
| 516 | class TargetScope BASE_EMBEDDED { |
| 517 | public: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 518 | explicit TargetScope(Target** variable) |
| 519 | : variable_(variable), previous_(*variable) { |
| 520 | *variable = NULL; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | ~TargetScope() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 524 | *variable_ = previous_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | private: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 528 | Target** variable_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 529 | Target* previous_; |
| 530 | }; |
| 531 | |
| 532 | |
| 533 | // ---------------------------------------------------------------------------- |
| 534 | // LexicalScope is a support class to facilitate manipulation of the |
| 535 | // Parser's scope stack. The constructor sets the parser's top scope |
| 536 | // to the incoming scope, and the destructor resets it. |
| 537 | |
| 538 | class LexicalScope BASE_EMBEDDED { |
| 539 | public: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 540 | LexicalScope(Scope** scope_variable, |
| 541 | int* with_nesting_level_variable, |
| 542 | Scope* scope) |
| 543 | : scope_variable_(scope_variable), |
| 544 | with_nesting_level_variable_(with_nesting_level_variable), |
| 545 | prev_scope_(*scope_variable), |
| 546 | prev_level_(*with_nesting_level_variable) { |
| 547 | *scope_variable = scope; |
| 548 | *with_nesting_level_variable = 0; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | ~LexicalScope() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 552 | (*scope_variable_)->Leave(); |
| 553 | *scope_variable_ = prev_scope_; |
| 554 | *with_nesting_level_variable_ = prev_level_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | private: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 558 | Scope** scope_variable_; |
| 559 | int* with_nesting_level_variable_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 560 | Scope* prev_scope_; |
| 561 | int prev_level_; |
| 562 | }; |
| 563 | |
| 564 | |
| 565 | // ---------------------------------------------------------------------------- |
| 566 | // The CHECK_OK macro is a convenient macro to enforce error |
| 567 | // handling for functions that may fail (by returning !*ok). |
| 568 | // |
| 569 | // CAUTION: This macro appends extra statements after a call, |
| 570 | // thus it must never be used where only a single statement |
| 571 | // is correct (e.g. an if statement branch w/o braces)! |
| 572 | |
| 573 | #define CHECK_OK ok); \ |
| 574 | if (!*ok) return NULL; \ |
| 575 | ((void)0 |
| 576 | #define DUMMY ) // to make indentation work |
| 577 | #undef DUMMY |
| 578 | |
| 579 | #define CHECK_FAILED /**/); \ |
| 580 | if (failed_) return NULL; \ |
| 581 | ((void)0 |
| 582 | #define DUMMY ) // to make indentation work |
| 583 | #undef DUMMY |
| 584 | |
| 585 | // ---------------------------------------------------------------------------- |
| 586 | // Implementation of Parser |
| 587 | |
| 588 | Parser::Parser(Handle<Script> script, |
| 589 | bool allow_natives_syntax, |
| 590 | v8::Extension* extension, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 591 | ScriptDataImpl* pre_data) |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 592 | : symbol_cache_(pre_data ? pre_data->symbol_count() : 0), |
| 593 | script_(script), |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 594 | scanner_(), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 595 | top_scope_(NULL), |
| 596 | with_nesting_level_(0), |
| 597 | temp_scope_(NULL), |
| 598 | target_stack_(NULL), |
| 599 | allow_natives_syntax_(allow_natives_syntax), |
| 600 | extension_(extension), |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 601 | pre_data_(pre_data), |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 602 | fni_(NULL), |
| 603 | stack_overflow_(false) { |
| 604 | AstNode::ResetIds(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 608 | FunctionLiteral* Parser::ParseProgram(Handle<String> source, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 609 | bool in_global_context) { |
| 610 | CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT); |
| 611 | |
| 612 | HistogramTimerScope timer(&Counters::parse); |
| 613 | Counters::total_parse_size.Increment(source->length()); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 614 | fni_ = new FuncNameInferrer(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 615 | |
| 616 | // Initialize parser state. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 617 | source->TryFlatten(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 618 | if (source->IsExternalTwoByteString()) { |
| 619 | // Notice that the stream is destroyed at the end of the branch block. |
| 620 | // The last line of the blocks can't be moved outside, even though they're |
| 621 | // identical calls. |
| 622 | ExternalTwoByteStringUC16CharacterStream stream( |
| 623 | Handle<ExternalTwoByteString>::cast(source), 0, source->length()); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 624 | scanner_.Initialize(&stream); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 625 | return DoParseProgram(source, in_global_context, &zone_scope); |
| 626 | } else { |
| 627 | GenericStringUC16CharacterStream stream(source, 0, source->length()); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 628 | scanner_.Initialize(&stream); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 629 | return DoParseProgram(source, in_global_context, &zone_scope); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | |
| 634 | FunctionLiteral* Parser::DoParseProgram(Handle<String> source, |
| 635 | bool in_global_context, |
| 636 | ZoneScope* zone_scope) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 637 | ASSERT(target_stack_ == NULL); |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 638 | if (pre_data_ != NULL) pre_data_->Initialize(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 639 | |
| 640 | // Compute the parsing mode. |
| 641 | mode_ = FLAG_lazy ? PARSE_LAZILY : PARSE_EAGERLY; |
| 642 | if (allow_natives_syntax_ || extension_ != NULL) mode_ = PARSE_EAGERLY; |
| 643 | |
| 644 | Scope::Type type = |
| 645 | in_global_context |
| 646 | ? Scope::GLOBAL_SCOPE |
| 647 | : Scope::EVAL_SCOPE; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 648 | Handle<String> no_name = Factory::empty_symbol(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 649 | |
| 650 | FunctionLiteral* result = NULL; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 651 | { Scope* scope = NewScope(top_scope_, type, inside_with()); |
| 652 | LexicalScope lexical_scope(&this->top_scope_, &this->with_nesting_level_, |
| 653 | scope); |
| 654 | TemporaryScope temp_scope(&this->temp_scope_); |
| 655 | ZoneList<Statement*>* body = new ZoneList<Statement*>(16); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 656 | bool ok = true; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 657 | ParseSourceElements(body, Token::EOS, &ok); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 658 | if (ok) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 659 | result = new FunctionLiteral( |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 660 | no_name, |
| 661 | top_scope_, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 662 | body, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 663 | temp_scope.materialized_literal_count(), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 664 | temp_scope.expected_property_count(), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 665 | temp_scope.only_simple_this_property_assignments(), |
| 666 | temp_scope.this_property_assignments(), |
| 667 | 0, |
| 668 | 0, |
| 669 | source->length(), |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 670 | false, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 671 | temp_scope.ContainsLoops()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 672 | } else if (stack_overflow_) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 673 | Top::StackOverflow(); |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | // Make sure the target stack is empty. |
| 678 | ASSERT(target_stack_ == NULL); |
| 679 | |
| 680 | // If there was a syntax error we have to get rid of the AST |
| 681 | // and it is not safe to do so before the scope has been deleted. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 682 | if (result == NULL) zone_scope->DeleteOnExit(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 683 | return result; |
| 684 | } |
| 685 | |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 686 | FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 687 | CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT); |
| 688 | HistogramTimerScope timer(&Counters::parse_lazy); |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 689 | Handle<String> source(String::cast(script_->source())); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 690 | Counters::total_parse_size.Increment(source->length()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 691 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 692 | // Initialize parser state. |
| 693 | source->TryFlatten(); |
| 694 | if (source->IsExternalTwoByteString()) { |
| 695 | ExternalTwoByteStringUC16CharacterStream stream( |
| 696 | Handle<ExternalTwoByteString>::cast(source), |
| 697 | info->start_position(), |
| 698 | info->end_position()); |
| 699 | FunctionLiteral* result = ParseLazy(info, &stream, &zone_scope); |
| 700 | return result; |
| 701 | } else { |
| 702 | GenericStringUC16CharacterStream stream(source, |
| 703 | info->start_position(), |
| 704 | info->end_position()); |
| 705 | FunctionLiteral* result = ParseLazy(info, &stream, &zone_scope); |
| 706 | return result; |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | |
| 711 | FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info, |
| 712 | UC16CharacterStream* source, |
| 713 | ZoneScope* zone_scope) { |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 714 | scanner_.Initialize(source); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 715 | ASSERT(target_stack_ == NULL); |
| 716 | |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 717 | Handle<String> name(String::cast(info->name())); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 718 | fni_ = new FuncNameInferrer(); |
| 719 | fni_->PushEnclosingName(name); |
| 720 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 721 | mode_ = PARSE_EAGERLY; |
| 722 | |
| 723 | // Place holder for the result. |
| 724 | FunctionLiteral* result = NULL; |
| 725 | |
| 726 | { |
| 727 | // Parse the function literal. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 728 | Handle<String> no_name = Factory::empty_symbol(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 729 | Scope* scope = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 730 | NewScope(top_scope_, Scope::GLOBAL_SCOPE, inside_with()); |
| 731 | LexicalScope lexical_scope(&this->top_scope_, &this->with_nesting_level_, |
| 732 | scope); |
| 733 | TemporaryScope temp_scope(&this->temp_scope_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 734 | |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 735 | FunctionLiteralType type = |
| 736 | info->is_expression() ? EXPRESSION : DECLARATION; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 737 | bool ok = true; |
| 738 | result = ParseFunctionLiteral(name, RelocInfo::kNoPosition, type, &ok); |
| 739 | // Make sure the results agree. |
| 740 | ASSERT(ok == (result != NULL)); |
| 741 | // The only errors should be stack overflows. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 742 | ASSERT(ok || stack_overflow_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | // Make sure the target stack is empty. |
| 746 | ASSERT(target_stack_ == NULL); |
| 747 | |
| 748 | // If there was a stack overflow we have to get rid of AST and it is |
| 749 | // not safe to do before scope has been deleted. |
| 750 | if (result == NULL) { |
| 751 | Top::StackOverflow(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 752 | zone_scope->DeleteOnExit(); |
| 753 | } else { |
| 754 | Handle<String> inferred_name(info->inferred_name()); |
| 755 | result->set_inferred_name(inferred_name); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 756 | } |
| 757 | return result; |
| 758 | } |
| 759 | |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 760 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 761 | Handle<String> Parser::GetSymbol(bool* ok) { |
| 762 | int symbol_id = -1; |
| 763 | if (pre_data() != NULL) { |
| 764 | symbol_id = pre_data()->GetSymbolIdentifier(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 765 | } |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 766 | return LookupSymbol(symbol_id); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 767 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 768 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 769 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 770 | void Parser::ReportMessage(const char* type, Vector<const char*> args) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 771 | Scanner::Location source_location = scanner().location(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 772 | ReportMessageAt(source_location, type, args); |
| 773 | } |
| 774 | |
| 775 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 776 | void Parser::ReportMessageAt(Scanner::Location source_location, |
| 777 | const char* type, |
| 778 | Vector<const char*> args) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 779 | MessageLocation location(script_, |
| 780 | source_location.beg_pos, source_location.end_pos); |
| 781 | Handle<JSArray> array = Factory::NewJSArray(args.length()); |
| 782 | for (int i = 0; i < args.length(); i++) { |
| 783 | SetElement(array, i, Factory::NewStringFromUtf8(CStrVector(args[i]))); |
| 784 | } |
| 785 | Handle<Object> result = Factory::NewSyntaxError(type, array); |
| 786 | Top::Throw(*result, &location); |
| 787 | } |
| 788 | |
| 789 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 790 | // Base class containing common code for the different finder classes used by |
| 791 | // the parser. |
| 792 | class ParserFinder { |
| 793 | protected: |
| 794 | ParserFinder() {} |
| 795 | static Assignment* AsAssignment(Statement* stat) { |
| 796 | if (stat == NULL) return NULL; |
| 797 | ExpressionStatement* exp_stat = stat->AsExpressionStatement(); |
| 798 | if (exp_stat == NULL) return NULL; |
| 799 | return exp_stat->expression()->AsAssignment(); |
| 800 | } |
| 801 | }; |
| 802 | |
| 803 | |
| 804 | // An InitializationBlockFinder finds and marks sequences of statements of the |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 805 | // form expr.a = ...; expr.b = ...; etc. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 806 | class InitializationBlockFinder : public ParserFinder { |
| 807 | public: |
| 808 | InitializationBlockFinder() |
| 809 | : first_in_block_(NULL), last_in_block_(NULL), block_size_(0) {} |
| 810 | |
| 811 | ~InitializationBlockFinder() { |
| 812 | if (InBlock()) EndBlock(); |
| 813 | } |
| 814 | |
| 815 | void Update(Statement* stat) { |
| 816 | Assignment* assignment = AsAssignment(stat); |
| 817 | if (InBlock()) { |
| 818 | if (BlockContinues(assignment)) { |
| 819 | UpdateBlock(assignment); |
| 820 | } else { |
| 821 | EndBlock(); |
| 822 | } |
| 823 | } |
| 824 | if (!InBlock() && (assignment != NULL) && |
| 825 | (assignment->op() == Token::ASSIGN)) { |
| 826 | StartBlock(assignment); |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | private: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 831 | // The minimum number of contiguous assignment that will |
| 832 | // be treated as an initialization block. Benchmarks show that |
| 833 | // the overhead exceeds the savings below this limit. |
| 834 | static const int kMinInitializationBlock = 3; |
| 835 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 836 | // Returns true if the expressions appear to denote the same object. |
| 837 | // In the context of initialization blocks, we only consider expressions |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 838 | // of the form 'expr.x' or expr["x"]. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 839 | static bool SameObject(Expression* e1, Expression* e2) { |
| 840 | VariableProxy* v1 = e1->AsVariableProxy(); |
| 841 | VariableProxy* v2 = e2->AsVariableProxy(); |
| 842 | if (v1 != NULL && v2 != NULL) { |
| 843 | return v1->name()->Equals(*v2->name()); |
| 844 | } |
| 845 | Property* p1 = e1->AsProperty(); |
| 846 | Property* p2 = e2->AsProperty(); |
| 847 | if ((p1 == NULL) || (p2 == NULL)) return false; |
| 848 | Literal* key1 = p1->key()->AsLiteral(); |
| 849 | Literal* key2 = p2->key()->AsLiteral(); |
| 850 | if ((key1 == NULL) || (key2 == NULL)) return false; |
| 851 | if (!key1->handle()->IsString() || !key2->handle()->IsString()) { |
| 852 | return false; |
| 853 | } |
| 854 | String* name1 = String::cast(*key1->handle()); |
| 855 | String* name2 = String::cast(*key2->handle()); |
| 856 | if (!name1->Equals(name2)) return false; |
| 857 | return SameObject(p1->obj(), p2->obj()); |
| 858 | } |
| 859 | |
| 860 | // Returns true if the expressions appear to denote different properties |
| 861 | // of the same object. |
| 862 | static bool PropertyOfSameObject(Expression* e1, Expression* e2) { |
| 863 | Property* p1 = e1->AsProperty(); |
| 864 | Property* p2 = e2->AsProperty(); |
| 865 | if ((p1 == NULL) || (p2 == NULL)) return false; |
| 866 | return SameObject(p1->obj(), p2->obj()); |
| 867 | } |
| 868 | |
| 869 | bool BlockContinues(Assignment* assignment) { |
| 870 | if ((assignment == NULL) || (first_in_block_ == NULL)) return false; |
| 871 | if (assignment->op() != Token::ASSIGN) return false; |
| 872 | return PropertyOfSameObject(first_in_block_->target(), |
| 873 | assignment->target()); |
| 874 | } |
| 875 | |
| 876 | void StartBlock(Assignment* assignment) { |
| 877 | first_in_block_ = assignment; |
| 878 | last_in_block_ = assignment; |
| 879 | block_size_ = 1; |
| 880 | } |
| 881 | |
| 882 | void UpdateBlock(Assignment* assignment) { |
| 883 | last_in_block_ = assignment; |
| 884 | ++block_size_; |
| 885 | } |
| 886 | |
| 887 | void EndBlock() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 888 | if (block_size_ >= kMinInitializationBlock) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 889 | first_in_block_->mark_block_start(); |
| 890 | last_in_block_->mark_block_end(); |
| 891 | } |
| 892 | last_in_block_ = first_in_block_ = NULL; |
| 893 | block_size_ = 0; |
| 894 | } |
| 895 | |
| 896 | bool InBlock() { return first_in_block_ != NULL; } |
| 897 | |
| 898 | Assignment* first_in_block_; |
| 899 | Assignment* last_in_block_; |
| 900 | int block_size_; |
| 901 | |
| 902 | DISALLOW_COPY_AND_ASSIGN(InitializationBlockFinder); |
| 903 | }; |
| 904 | |
| 905 | |
| 906 | // A ThisNamedPropertyAssigmentFinder finds and marks statements of the form |
| 907 | // this.x = ...;, where x is a named property. It also determines whether a |
| 908 | // function contains only assignments of this type. |
| 909 | class ThisNamedPropertyAssigmentFinder : public ParserFinder { |
| 910 | public: |
| 911 | ThisNamedPropertyAssigmentFinder() |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 912 | : only_simple_this_property_assignments_(true), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 913 | names_(NULL), |
| 914 | assigned_arguments_(NULL), |
| 915 | assigned_constants_(NULL) {} |
| 916 | |
| 917 | void Update(Scope* scope, Statement* stat) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 918 | // Bail out if function already has property assignment that are |
| 919 | // not simple this property assignments. |
| 920 | if (!only_simple_this_property_assignments_) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 921 | return; |
| 922 | } |
| 923 | |
| 924 | // Check whether this statement is of the form this.x = ...; |
| 925 | Assignment* assignment = AsAssignment(stat); |
| 926 | if (IsThisPropertyAssignment(assignment)) { |
| 927 | HandleThisPropertyAssignment(scope, assignment); |
| 928 | } else { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 929 | only_simple_this_property_assignments_ = false; |
| 930 | } |
| 931 | } |
| 932 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 933 | // Returns whether only statements of the form this.x = y; where y is either a |
| 934 | // constant or a function argument was encountered. |
| 935 | bool only_simple_this_property_assignments() { |
| 936 | return only_simple_this_property_assignments_; |
| 937 | } |
| 938 | |
| 939 | // Returns a fixed array containing three elements for each assignment of the |
| 940 | // form this.x = y; |
| 941 | Handle<FixedArray> GetThisPropertyAssignments() { |
| 942 | if (names_ == NULL) { |
| 943 | return Factory::empty_fixed_array(); |
| 944 | } |
| 945 | ASSERT(names_ != NULL); |
| 946 | ASSERT(assigned_arguments_ != NULL); |
| 947 | ASSERT_EQ(names_->length(), assigned_arguments_->length()); |
| 948 | ASSERT_EQ(names_->length(), assigned_constants_->length()); |
| 949 | Handle<FixedArray> assignments = |
| 950 | Factory::NewFixedArray(names_->length() * 3); |
| 951 | for (int i = 0; i < names_->length(); i++) { |
| 952 | assignments->set(i * 3, *names_->at(i)); |
| 953 | assignments->set(i * 3 + 1, Smi::FromInt(assigned_arguments_->at(i))); |
| 954 | assignments->set(i * 3 + 2, *assigned_constants_->at(i)); |
| 955 | } |
| 956 | return assignments; |
| 957 | } |
| 958 | |
| 959 | private: |
| 960 | bool IsThisPropertyAssignment(Assignment* assignment) { |
| 961 | if (assignment != NULL) { |
| 962 | Property* property = assignment->target()->AsProperty(); |
| 963 | return assignment->op() == Token::ASSIGN |
| 964 | && property != NULL |
| 965 | && property->obj()->AsVariableProxy() != NULL |
| 966 | && property->obj()->AsVariableProxy()->is_this(); |
| 967 | } |
| 968 | return false; |
| 969 | } |
| 970 | |
| 971 | void HandleThisPropertyAssignment(Scope* scope, Assignment* assignment) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 972 | // Check that the property assigned to is a named property, which is not |
| 973 | // __proto__. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 974 | Property* property = assignment->target()->AsProperty(); |
| 975 | ASSERT(property != NULL); |
| 976 | Literal* literal = property->key()->AsLiteral(); |
| 977 | uint32_t dummy; |
| 978 | if (literal != NULL && |
| 979 | literal->handle()->IsString() && |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 980 | !String::cast(*(literal->handle()))->Equals(Heap::Proto_symbol()) && |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 981 | !String::cast(*(literal->handle()))->AsArrayIndex(&dummy)) { |
| 982 | Handle<String> key = Handle<String>::cast(literal->handle()); |
| 983 | |
| 984 | // Check whether the value assigned is either a constant or matches the |
| 985 | // name of one of the arguments to the function. |
| 986 | if (assignment->value()->AsLiteral() != NULL) { |
| 987 | // Constant assigned. |
| 988 | Literal* literal = assignment->value()->AsLiteral(); |
| 989 | AssignmentFromConstant(key, literal->handle()); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 990 | return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 991 | } else if (assignment->value()->AsVariableProxy() != NULL) { |
| 992 | // Variable assigned. |
| 993 | Handle<String> name = |
| 994 | assignment->value()->AsVariableProxy()->name(); |
| 995 | // Check whether the variable assigned matches an argument name. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 996 | for (int i = 0; i < scope->num_parameters(); i++) { |
| 997 | if (*scope->parameter(i)->name() == *name) { |
| 998 | // Assigned from function argument. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 999 | AssignmentFromParameter(key, i); |
| 1000 | return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1001 | } |
| 1002 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1003 | } |
| 1004 | } |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1005 | // It is not a simple "this.x = value;" assignment with a constant |
| 1006 | // or parameter value. |
| 1007 | AssignmentFromSomethingElse(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | void AssignmentFromParameter(Handle<String> name, int index) { |
| 1011 | EnsureAllocation(); |
| 1012 | names_->Add(name); |
| 1013 | assigned_arguments_->Add(index); |
| 1014 | assigned_constants_->Add(Factory::undefined_value()); |
| 1015 | } |
| 1016 | |
| 1017 | void AssignmentFromConstant(Handle<String> name, Handle<Object> value) { |
| 1018 | EnsureAllocation(); |
| 1019 | names_->Add(name); |
| 1020 | assigned_arguments_->Add(-1); |
| 1021 | assigned_constants_->Add(value); |
| 1022 | } |
| 1023 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1024 | void AssignmentFromSomethingElse() { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1025 | // The this assignment is not a simple one. |
| 1026 | only_simple_this_property_assignments_ = false; |
| 1027 | } |
| 1028 | |
| 1029 | void EnsureAllocation() { |
| 1030 | if (names_ == NULL) { |
| 1031 | ASSERT(assigned_arguments_ == NULL); |
| 1032 | ASSERT(assigned_constants_ == NULL); |
| 1033 | names_ = new ZoneStringList(4); |
| 1034 | assigned_arguments_ = new ZoneList<int>(4); |
| 1035 | assigned_constants_ = new ZoneObjectList(4); |
| 1036 | } |
| 1037 | } |
| 1038 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1039 | bool only_simple_this_property_assignments_; |
| 1040 | ZoneStringList* names_; |
| 1041 | ZoneList<int>* assigned_arguments_; |
| 1042 | ZoneObjectList* assigned_constants_; |
| 1043 | }; |
| 1044 | |
| 1045 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1046 | void* Parser::ParseSourceElements(ZoneList<Statement*>* processor, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1047 | int end_token, |
| 1048 | bool* ok) { |
| 1049 | // SourceElements :: |
| 1050 | // (Statement)* <end_token> |
| 1051 | |
| 1052 | // Allocate a target stack to use for this set of source |
| 1053 | // elements. This way, all scripts and functions get their own |
| 1054 | // target stack thus avoiding illegal breaks and continues across |
| 1055 | // functions. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1056 | TargetScope scope(&this->target_stack_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1057 | |
| 1058 | ASSERT(processor != NULL); |
| 1059 | InitializationBlockFinder block_finder; |
| 1060 | ThisNamedPropertyAssigmentFinder this_property_assignment_finder; |
| 1061 | while (peek() != end_token) { |
| 1062 | Statement* stat = ParseStatement(NULL, CHECK_OK); |
| 1063 | if (stat == NULL || stat->IsEmpty()) continue; |
| 1064 | // We find and mark the initialization blocks on top level code only. |
| 1065 | // This is because the optimization prevents reuse of the map transitions, |
| 1066 | // so it should be used only for code that will only be run once. |
| 1067 | if (top_scope_->is_global_scope()) { |
| 1068 | block_finder.Update(stat); |
| 1069 | } |
| 1070 | // Find and mark all assignments to named properties in this (this.x =) |
| 1071 | if (top_scope_->is_function_scope()) { |
| 1072 | this_property_assignment_finder.Update(top_scope_, stat); |
| 1073 | } |
| 1074 | processor->Add(stat); |
| 1075 | } |
| 1076 | |
| 1077 | // Propagate the collected information on this property assignments. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1078 | if (top_scope_->is_function_scope()) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1079 | bool only_simple_this_property_assignments = |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1080 | this_property_assignment_finder.only_simple_this_property_assignments() |
| 1081 | && top_scope_->declarations()->length() == 0; |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1082 | if (only_simple_this_property_assignments) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1083 | temp_scope_->SetThisPropertyAssignmentInfo( |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1084 | only_simple_this_property_assignments, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1085 | this_property_assignment_finder.GetThisPropertyAssignments()); |
| 1086 | } |
| 1087 | } |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | |
| 1092 | Statement* Parser::ParseStatement(ZoneStringList* labels, bool* ok) { |
| 1093 | // Statement :: |
| 1094 | // Block |
| 1095 | // VariableStatement |
| 1096 | // EmptyStatement |
| 1097 | // ExpressionStatement |
| 1098 | // IfStatement |
| 1099 | // IterationStatement |
| 1100 | // ContinueStatement |
| 1101 | // BreakStatement |
| 1102 | // ReturnStatement |
| 1103 | // WithStatement |
| 1104 | // LabelledStatement |
| 1105 | // SwitchStatement |
| 1106 | // ThrowStatement |
| 1107 | // TryStatement |
| 1108 | // DebuggerStatement |
| 1109 | |
| 1110 | // Note: Since labels can only be used by 'break' and 'continue' |
| 1111 | // statements, which themselves are only valid within blocks, |
| 1112 | // iterations or 'switch' statements (i.e., BreakableStatements), |
| 1113 | // labels can be simply ignored in all other cases; except for |
| 1114 | // trivial labeled break statements 'label: break label' which is |
| 1115 | // parsed into an empty statement. |
| 1116 | |
| 1117 | // Keep the source position of the statement |
| 1118 | int statement_pos = scanner().peek_location().beg_pos; |
| 1119 | Statement* stmt = NULL; |
| 1120 | switch (peek()) { |
| 1121 | case Token::LBRACE: |
| 1122 | return ParseBlock(labels, ok); |
| 1123 | |
| 1124 | case Token::CONST: // fall through |
| 1125 | case Token::VAR: |
| 1126 | stmt = ParseVariableStatement(ok); |
| 1127 | break; |
| 1128 | |
| 1129 | case Token::SEMICOLON: |
| 1130 | Next(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1131 | return EmptyStatement(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1132 | |
| 1133 | case Token::IF: |
| 1134 | stmt = ParseIfStatement(labels, ok); |
| 1135 | break; |
| 1136 | |
| 1137 | case Token::DO: |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1138 | stmt = ParseDoWhileStatement(labels, ok); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1139 | break; |
| 1140 | |
| 1141 | case Token::WHILE: |
| 1142 | stmt = ParseWhileStatement(labels, ok); |
| 1143 | break; |
| 1144 | |
| 1145 | case Token::FOR: |
| 1146 | stmt = ParseForStatement(labels, ok); |
| 1147 | break; |
| 1148 | |
| 1149 | case Token::CONTINUE: |
| 1150 | stmt = ParseContinueStatement(ok); |
| 1151 | break; |
| 1152 | |
| 1153 | case Token::BREAK: |
| 1154 | stmt = ParseBreakStatement(labels, ok); |
| 1155 | break; |
| 1156 | |
| 1157 | case Token::RETURN: |
| 1158 | stmt = ParseReturnStatement(ok); |
| 1159 | break; |
| 1160 | |
| 1161 | case Token::WITH: |
| 1162 | stmt = ParseWithStatement(labels, ok); |
| 1163 | break; |
| 1164 | |
| 1165 | case Token::SWITCH: |
| 1166 | stmt = ParseSwitchStatement(labels, ok); |
| 1167 | break; |
| 1168 | |
| 1169 | case Token::THROW: |
| 1170 | stmt = ParseThrowStatement(ok); |
| 1171 | break; |
| 1172 | |
| 1173 | case Token::TRY: { |
| 1174 | // NOTE: It is somewhat complicated to have labels on |
| 1175 | // try-statements. When breaking out of a try-finally statement, |
| 1176 | // one must take great care not to treat it as a |
| 1177 | // fall-through. It is much easier just to wrap the entire |
| 1178 | // try-statement in a statement block and put the labels there |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1179 | Block* result = new Block(labels, 1, false); |
| 1180 | Target target(&this->target_stack_, result); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1181 | TryStatement* statement = ParseTryStatement(CHECK_OK); |
| 1182 | if (statement) { |
| 1183 | statement->set_statement_pos(statement_pos); |
| 1184 | } |
| 1185 | if (result) result->AddStatement(statement); |
| 1186 | return result; |
| 1187 | } |
| 1188 | |
| 1189 | case Token::FUNCTION: |
| 1190 | return ParseFunctionDeclaration(ok); |
| 1191 | |
| 1192 | case Token::NATIVE: |
| 1193 | return ParseNativeDeclaration(ok); |
| 1194 | |
| 1195 | case Token::DEBUGGER: |
| 1196 | stmt = ParseDebuggerStatement(ok); |
| 1197 | break; |
| 1198 | |
| 1199 | default: |
| 1200 | stmt = ParseExpressionOrLabelledStatement(labels, ok); |
| 1201 | } |
| 1202 | |
| 1203 | // Store the source position of the statement |
| 1204 | if (stmt != NULL) stmt->set_statement_pos(statement_pos); |
| 1205 | return stmt; |
| 1206 | } |
| 1207 | |
| 1208 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1209 | VariableProxy* Parser::Declare(Handle<String> name, |
| 1210 | Variable::Mode mode, |
| 1211 | FunctionLiteral* fun, |
| 1212 | bool resolve, |
| 1213 | bool* ok) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1214 | Variable* var = NULL; |
| 1215 | // If we are inside a function, a declaration of a variable |
| 1216 | // is a truly local variable, and the scope of the variable |
| 1217 | // is always the function scope. |
| 1218 | |
| 1219 | // If a function scope exists, then we can statically declare this |
| 1220 | // variable and also set its mode. In any case, a Declaration node |
| 1221 | // will be added to the scope so that the declaration can be added |
| 1222 | // to the corresponding activation frame at runtime if necessary. |
| 1223 | // For instance declarations inside an eval scope need to be added |
| 1224 | // to the calling function context. |
| 1225 | if (top_scope_->is_function_scope()) { |
| 1226 | // Declare the variable in the function scope. |
| 1227 | var = top_scope_->LocalLookup(name); |
| 1228 | if (var == NULL) { |
| 1229 | // Declare the name. |
| 1230 | var = top_scope_->DeclareLocal(name, mode); |
| 1231 | } else { |
| 1232 | // The name was declared before; check for conflicting |
| 1233 | // re-declarations. If the previous declaration was a const or the |
| 1234 | // current declaration is a const then we have a conflict. There is |
| 1235 | // similar code in runtime.cc in the Declare functions. |
| 1236 | if ((mode == Variable::CONST) || (var->mode() == Variable::CONST)) { |
| 1237 | // We only have vars and consts in declarations. |
| 1238 | ASSERT(var->mode() == Variable::VAR || |
| 1239 | var->mode() == Variable::CONST); |
| 1240 | const char* type = (var->mode() == Variable::VAR) ? "var" : "const"; |
| 1241 | Handle<String> type_string = |
| 1242 | Factory::NewStringFromUtf8(CStrVector(type), TENURED); |
| 1243 | Expression* expression = |
| 1244 | NewThrowTypeError(Factory::redeclaration_symbol(), |
| 1245 | type_string, name); |
| 1246 | top_scope_->SetIllegalRedeclaration(expression); |
| 1247 | } |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | // We add a declaration node for every declaration. The compiler |
| 1252 | // will only generate code if necessary. In particular, declarations |
| 1253 | // for inner local variables that do not represent functions won't |
| 1254 | // result in any generated code. |
| 1255 | // |
| 1256 | // Note that we always add an unresolved proxy even if it's not |
| 1257 | // used, simply because we don't know in this method (w/o extra |
| 1258 | // parameters) if the proxy is needed or not. The proxy will be |
| 1259 | // bound during variable resolution time unless it was pre-bound |
| 1260 | // below. |
| 1261 | // |
| 1262 | // WARNING: This will lead to multiple declaration nodes for the |
| 1263 | // same variable if it is declared several times. This is not a |
| 1264 | // semantic issue as long as we keep the source order, but it may be |
| 1265 | // a performance issue since it may lead to repeated |
| 1266 | // Runtime::DeclareContextSlot() calls. |
| 1267 | VariableProxy* proxy = top_scope_->NewUnresolved(name, inside_with()); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1268 | top_scope_->AddDeclaration(new Declaration(proxy, mode, fun)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1269 | |
| 1270 | // For global const variables we bind the proxy to a variable. |
| 1271 | if (mode == Variable::CONST && top_scope_->is_global_scope()) { |
| 1272 | ASSERT(resolve); // should be set by all callers |
| 1273 | Variable::Kind kind = Variable::NORMAL; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1274 | var = new Variable(top_scope_, name, Variable::CONST, true, kind); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | // If requested and we have a local variable, bind the proxy to the variable |
| 1278 | // at parse-time. This is used for functions (and consts) declared inside |
| 1279 | // statements: the corresponding function (or const) variable must be in the |
| 1280 | // function scope and not a statement-local scope, e.g. as provided with a |
| 1281 | // 'with' statement: |
| 1282 | // |
| 1283 | // with (obj) { |
| 1284 | // function f() {} |
| 1285 | // } |
| 1286 | // |
| 1287 | // which is translated into: |
| 1288 | // |
| 1289 | // with (obj) { |
| 1290 | // // in this case this is not: 'var f; f = function () {};' |
| 1291 | // var f = function () {}; |
| 1292 | // } |
| 1293 | // |
| 1294 | // Note that if 'f' is accessed from inside the 'with' statement, it |
| 1295 | // will be allocated in the context (because we must be able to look |
| 1296 | // it up dynamically) but it will also be accessed statically, i.e., |
| 1297 | // with a context slot index and a context chain length for this |
| 1298 | // initialization code. Thus, inside the 'with' statement, we need |
| 1299 | // both access to the static and the dynamic context chain; the |
| 1300 | // runtime needs to provide both. |
| 1301 | if (resolve && var != NULL) proxy->BindTo(var); |
| 1302 | |
| 1303 | return proxy; |
| 1304 | } |
| 1305 | |
| 1306 | |
| 1307 | // Language extension which is only enabled for source files loaded |
| 1308 | // through the API's extension mechanism. A native function |
| 1309 | // declaration is resolved by looking up the function through a |
| 1310 | // callback provided by the extension. |
| 1311 | Statement* Parser::ParseNativeDeclaration(bool* ok) { |
| 1312 | if (extension_ == NULL) { |
| 1313 | ReportUnexpectedToken(Token::NATIVE); |
| 1314 | *ok = false; |
| 1315 | return NULL; |
| 1316 | } |
| 1317 | |
| 1318 | Expect(Token::NATIVE, CHECK_OK); |
| 1319 | Expect(Token::FUNCTION, CHECK_OK); |
| 1320 | Handle<String> name = ParseIdentifier(CHECK_OK); |
| 1321 | Expect(Token::LPAREN, CHECK_OK); |
| 1322 | bool done = (peek() == Token::RPAREN); |
| 1323 | while (!done) { |
| 1324 | ParseIdentifier(CHECK_OK); |
| 1325 | done = (peek() == Token::RPAREN); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1326 | if (!done) { |
| 1327 | Expect(Token::COMMA, CHECK_OK); |
| 1328 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1329 | } |
| 1330 | Expect(Token::RPAREN, CHECK_OK); |
| 1331 | Expect(Token::SEMICOLON, CHECK_OK); |
| 1332 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1333 | // Make sure that the function containing the native declaration |
| 1334 | // isn't lazily compiled. The extension structures are only |
| 1335 | // accessible while parsing the first time not when reparsing |
| 1336 | // because of lazy compilation. |
| 1337 | top_scope_->ForceEagerCompilation(); |
| 1338 | |
| 1339 | // Compute the function template for the native function. |
| 1340 | v8::Handle<v8::FunctionTemplate> fun_template = |
| 1341 | extension_->GetNativeFunction(v8::Utils::ToLocal(name)); |
| 1342 | ASSERT(!fun_template.IsEmpty()); |
| 1343 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1344 | // Instantiate the function and create a shared function info from it. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1345 | Handle<JSFunction> fun = Utils::OpenHandle(*fun_template->GetFunction()); |
| 1346 | const int literals = fun->NumberOfLiterals(); |
| 1347 | Handle<Code> code = Handle<Code>(fun->shared()->code()); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1348 | Handle<Code> construct_stub = Handle<Code>(fun->shared()->construct_stub()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1349 | Handle<SharedFunctionInfo> shared = |
Ben Murdoch | 3bec4d2 | 2010-07-22 14:51:16 +0100 | [diff] [blame] | 1350 | Factory::NewSharedFunctionInfo(name, literals, code, |
| 1351 | Handle<SerializedScopeInfo>(fun->shared()->scope_info())); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1352 | shared->set_construct_stub(*construct_stub); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1353 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1354 | // Copy the function data to the shared function info. |
| 1355 | shared->set_function_data(fun->shared()->function_data()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1356 | int parameters = fun->shared()->formal_parameter_count(); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1357 | shared->set_formal_parameter_count(parameters); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1358 | |
| 1359 | // TODO(1240846): It's weird that native function declarations are |
| 1360 | // introduced dynamically when we meet their declarations, whereas |
| 1361 | // other functions are setup when entering the surrounding scope. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1362 | SharedFunctionInfoLiteral* lit = new SharedFunctionInfoLiteral(shared); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1363 | VariableProxy* var = Declare(name, Variable::VAR, NULL, true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1364 | return new ExpressionStatement( |
| 1365 | new Assignment(Token::INIT_VAR, var, lit, RelocInfo::kNoPosition)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | |
| 1369 | Statement* Parser::ParseFunctionDeclaration(bool* ok) { |
| 1370 | // FunctionDeclaration :: |
| 1371 | // 'function' Identifier '(' FormalParameterListopt ')' '{' FunctionBody '}' |
| 1372 | Expect(Token::FUNCTION, CHECK_OK); |
| 1373 | int function_token_position = scanner().location().beg_pos; |
| 1374 | Handle<String> name = ParseIdentifier(CHECK_OK); |
| 1375 | FunctionLiteral* fun = ParseFunctionLiteral(name, |
| 1376 | function_token_position, |
| 1377 | DECLARATION, |
| 1378 | CHECK_OK); |
| 1379 | // Even if we're not at the top-level of the global or a function |
| 1380 | // scope, we treat is as such and introduce the function with it's |
| 1381 | // initial value upon entering the corresponding scope. |
| 1382 | Declare(name, Variable::VAR, fun, true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1383 | return EmptyStatement(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1384 | } |
| 1385 | |
| 1386 | |
| 1387 | Block* Parser::ParseBlock(ZoneStringList* labels, bool* ok) { |
| 1388 | // Block :: |
| 1389 | // '{' Statement* '}' |
| 1390 | |
| 1391 | // Note that a Block does not introduce a new execution scope! |
| 1392 | // (ECMA-262, 3rd, 12.2) |
| 1393 | // |
| 1394 | // Construct block expecting 16 statements. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1395 | Block* result = new Block(labels, 16, false); |
| 1396 | Target target(&this->target_stack_, result); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1397 | Expect(Token::LBRACE, CHECK_OK); |
| 1398 | while (peek() != Token::RBRACE) { |
| 1399 | Statement* stat = ParseStatement(NULL, CHECK_OK); |
| 1400 | if (stat && !stat->IsEmpty()) result->AddStatement(stat); |
| 1401 | } |
| 1402 | Expect(Token::RBRACE, CHECK_OK); |
| 1403 | return result; |
| 1404 | } |
| 1405 | |
| 1406 | |
| 1407 | Block* Parser::ParseVariableStatement(bool* ok) { |
| 1408 | // VariableStatement :: |
| 1409 | // VariableDeclarations ';' |
| 1410 | |
| 1411 | Expression* dummy; // to satisfy the ParseVariableDeclarations() signature |
| 1412 | Block* result = ParseVariableDeclarations(true, &dummy, CHECK_OK); |
| 1413 | ExpectSemicolon(CHECK_OK); |
| 1414 | return result; |
| 1415 | } |
| 1416 | |
| 1417 | |
| 1418 | // If the variable declaration declares exactly one non-const |
| 1419 | // variable, then *var is set to that variable. In all other cases, |
| 1420 | // *var is untouched; in particular, it is the caller's responsibility |
| 1421 | // to initialize it properly. This mechanism is used for the parsing |
| 1422 | // of 'for-in' loops. |
| 1423 | Block* Parser::ParseVariableDeclarations(bool accept_IN, |
| 1424 | Expression** var, |
| 1425 | bool* ok) { |
| 1426 | // VariableDeclarations :: |
| 1427 | // ('var' | 'const') (Identifier ('=' AssignmentExpression)?)+[','] |
| 1428 | |
| 1429 | Variable::Mode mode = Variable::VAR; |
| 1430 | bool is_const = false; |
| 1431 | if (peek() == Token::VAR) { |
| 1432 | Consume(Token::VAR); |
| 1433 | } else if (peek() == Token::CONST) { |
| 1434 | Consume(Token::CONST); |
| 1435 | mode = Variable::CONST; |
| 1436 | is_const = true; |
| 1437 | } else { |
| 1438 | UNREACHABLE(); // by current callers |
| 1439 | } |
| 1440 | |
| 1441 | // The scope of a variable/const declared anywhere inside a function |
| 1442 | // is the entire function (ECMA-262, 3rd, 10.1.3, and 12.2). Thus we can |
| 1443 | // transform a source-level variable/const declaration into a (Function) |
| 1444 | // Scope declaration, and rewrite the source-level initialization into an |
| 1445 | // assignment statement. We use a block to collect multiple assignments. |
| 1446 | // |
| 1447 | // We mark the block as initializer block because we don't want the |
| 1448 | // rewriter to add a '.result' assignment to such a block (to get compliant |
| 1449 | // behavior for code such as print(eval('var x = 7')), and for cosmetic |
| 1450 | // reasons when pretty-printing. Also, unless an assignment (initialization) |
| 1451 | // is inside an initializer block, it is ignored. |
| 1452 | // |
| 1453 | // Create new block with one expected declaration. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1454 | Block* block = new Block(NULL, 1, true); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1455 | VariableProxy* last_var = NULL; // the last variable declared |
| 1456 | int nvars = 0; // the number of variables declared |
| 1457 | do { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 1458 | if (fni_ != NULL) fni_->Enter(); |
| 1459 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1460 | // Parse variable name. |
| 1461 | if (nvars > 0) Consume(Token::COMMA); |
| 1462 | Handle<String> name = ParseIdentifier(CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 1463 | if (fni_ != NULL) fni_->PushVariableName(name); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1464 | |
| 1465 | // Declare variable. |
| 1466 | // Note that we *always* must treat the initial value via a separate init |
| 1467 | // assignment for variables and constants because the value must be assigned |
| 1468 | // when the variable is encountered in the source. But the variable/constant |
| 1469 | // is declared (and set to 'undefined') upon entering the function within |
| 1470 | // which the variable or constant is declared. Only function variables have |
| 1471 | // an initial value in the declaration (because they are initialized upon |
| 1472 | // entering the function). |
| 1473 | // |
| 1474 | // If we have a const declaration, in an inner scope, the proxy is always |
| 1475 | // bound to the declared variable (independent of possibly surrounding with |
| 1476 | // statements). |
| 1477 | last_var = Declare(name, mode, NULL, |
| 1478 | is_const /* always bound for CONST! */, |
| 1479 | CHECK_OK); |
| 1480 | nvars++; |
| 1481 | |
| 1482 | // Parse initialization expression if present and/or needed. A |
| 1483 | // declaration of the form: |
| 1484 | // |
| 1485 | // var v = x; |
| 1486 | // |
| 1487 | // is syntactic sugar for: |
| 1488 | // |
| 1489 | // var v; v = x; |
| 1490 | // |
| 1491 | // In particular, we need to re-lookup 'v' as it may be a |
| 1492 | // different 'v' than the 'v' in the declaration (if we are inside |
| 1493 | // a 'with' statement that makes a object property with name 'v' |
| 1494 | // visible). |
| 1495 | // |
| 1496 | // However, note that const declarations are different! A const |
| 1497 | // declaration of the form: |
| 1498 | // |
| 1499 | // const c = x; |
| 1500 | // |
| 1501 | // is *not* syntactic sugar for: |
| 1502 | // |
| 1503 | // const c; c = x; |
| 1504 | // |
| 1505 | // The "variable" c initialized to x is the same as the declared |
| 1506 | // one - there is no re-lookup (see the last parameter of the |
| 1507 | // Declare() call above). |
| 1508 | |
| 1509 | Expression* value = NULL; |
| 1510 | int position = -1; |
| 1511 | if (peek() == Token::ASSIGN) { |
| 1512 | Expect(Token::ASSIGN, CHECK_OK); |
| 1513 | position = scanner().location().beg_pos; |
| 1514 | value = ParseAssignmentExpression(accept_IN, CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 1515 | // Don't infer if it is "a = function(){...}();"-like expression. |
| 1516 | if (fni_ != NULL && value->AsCall() == NULL) fni_->Infer(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1517 | } |
| 1518 | |
| 1519 | // Make sure that 'const c' actually initializes 'c' to undefined |
| 1520 | // even though it seems like a stupid thing to do. |
| 1521 | if (value == NULL && is_const) { |
| 1522 | value = GetLiteralUndefined(); |
| 1523 | } |
| 1524 | |
| 1525 | // Global variable declarations must be compiled in a specific |
| 1526 | // way. When the script containing the global variable declaration |
| 1527 | // is entered, the global variable must be declared, so that if it |
| 1528 | // doesn't exist (not even in a prototype of the global object) it |
| 1529 | // gets created with an initial undefined value. This is handled |
| 1530 | // by the declarations part of the function representing the |
| 1531 | // top-level global code; see Runtime::DeclareGlobalVariable. If |
| 1532 | // it already exists (in the object or in a prototype), it is |
| 1533 | // *not* touched until the variable declaration statement is |
| 1534 | // executed. |
| 1535 | // |
| 1536 | // Executing the variable declaration statement will always |
| 1537 | // guarantee to give the global object a "local" variable; a |
| 1538 | // variable defined in the global object and not in any |
| 1539 | // prototype. This way, global variable declarations can shadow |
| 1540 | // properties in the prototype chain, but only after the variable |
| 1541 | // declaration statement has been executed. This is important in |
| 1542 | // browsers where the global object (window) has lots of |
| 1543 | // properties defined in prototype objects. |
| 1544 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1545 | if (top_scope_->is_global_scope()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1546 | // Compute the arguments for the runtime call. |
| 1547 | ZoneList<Expression*>* arguments = new ZoneList<Expression*>(2); |
| 1548 | // Be careful not to assign a value to the global variable if |
| 1549 | // we're in a with. The initialization value should not |
| 1550 | // necessarily be stored in the global object in that case, |
| 1551 | // which is why we need to generate a separate assignment node. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1552 | arguments->Add(new Literal(name)); // we have at least 1 parameter |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1553 | if (is_const || (value != NULL && !inside_with())) { |
| 1554 | arguments->Add(value); |
| 1555 | value = NULL; // zap the value to avoid the unnecessary assignment |
| 1556 | } |
| 1557 | // Construct the call to Runtime::DeclareGlobal{Variable,Const}Locally |
| 1558 | // and add it to the initialization statement block. Note that |
| 1559 | // this function does different things depending on if we have |
| 1560 | // 1 or 2 parameters. |
| 1561 | CallRuntime* initialize; |
| 1562 | if (is_const) { |
| 1563 | initialize = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1564 | new CallRuntime( |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1565 | Factory::InitializeConstGlobal_symbol(), |
| 1566 | Runtime::FunctionForId(Runtime::kInitializeConstGlobal), |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1567 | arguments); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1568 | } else { |
| 1569 | initialize = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1570 | new CallRuntime( |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1571 | Factory::InitializeVarGlobal_symbol(), |
| 1572 | Runtime::FunctionForId(Runtime::kInitializeVarGlobal), |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1573 | arguments); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1574 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1575 | block->AddStatement(new ExpressionStatement(initialize)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1576 | } |
| 1577 | |
| 1578 | // Add an assignment node to the initialization statement block if |
| 1579 | // we still have a pending initialization value. We must distinguish |
| 1580 | // between variables and constants: Variable initializations are simply |
| 1581 | // assignments (with all the consequences if they are inside a 'with' |
| 1582 | // statement - they may change a 'with' object property). Constant |
| 1583 | // initializations always assign to the declared constant which is |
| 1584 | // always at the function scope level. This is only relevant for |
| 1585 | // dynamically looked-up variables and constants (the start context |
| 1586 | // for constant lookups is always the function context, while it is |
| 1587 | // the top context for variables). Sigh... |
| 1588 | if (value != NULL) { |
| 1589 | Token::Value op = (is_const ? Token::INIT_CONST : Token::INIT_VAR); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1590 | Assignment* assignment = new Assignment(op, last_var, value, position); |
| 1591 | if (block) block->AddStatement(new ExpressionStatement(assignment)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1592 | } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 1593 | |
| 1594 | if (fni_ != NULL) fni_->Leave(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1595 | } while (peek() == Token::COMMA); |
| 1596 | |
| 1597 | if (!is_const && nvars == 1) { |
| 1598 | // We have a single, non-const variable. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1599 | ASSERT(last_var != NULL); |
| 1600 | *var = last_var; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1601 | } |
| 1602 | |
| 1603 | return block; |
| 1604 | } |
| 1605 | |
| 1606 | |
| 1607 | static bool ContainsLabel(ZoneStringList* labels, Handle<String> label) { |
| 1608 | ASSERT(!label.is_null()); |
| 1609 | if (labels != NULL) |
| 1610 | for (int i = labels->length(); i-- > 0; ) |
| 1611 | if (labels->at(i).is_identical_to(label)) |
| 1612 | return true; |
| 1613 | |
| 1614 | return false; |
| 1615 | } |
| 1616 | |
| 1617 | |
| 1618 | Statement* Parser::ParseExpressionOrLabelledStatement(ZoneStringList* labels, |
| 1619 | bool* ok) { |
| 1620 | // ExpressionStatement | LabelledStatement :: |
| 1621 | // Expression ';' |
| 1622 | // Identifier ':' Statement |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1623 | bool starts_with_idenfifier = (peek() == Token::IDENTIFIER); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1624 | Expression* expr = ParseExpression(true, CHECK_OK); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1625 | if (peek() == Token::COLON && starts_with_idenfifier && expr && |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1626 | expr->AsVariableProxy() != NULL && |
| 1627 | !expr->AsVariableProxy()->is_this()) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1628 | // Expression is a single identifier, and not, e.g., a parenthesized |
| 1629 | // identifier. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1630 | VariableProxy* var = expr->AsVariableProxy(); |
| 1631 | Handle<String> label = var->name(); |
| 1632 | // TODO(1240780): We don't check for redeclaration of labels |
| 1633 | // during preparsing since keeping track of the set of active |
| 1634 | // labels requires nontrivial changes to the way scopes are |
| 1635 | // structured. However, these are probably changes we want to |
| 1636 | // make later anyway so we should go back and fix this then. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1637 | if (ContainsLabel(labels, label) || TargetStackContainsLabel(label)) { |
| 1638 | SmartPointer<char> c_string = label->ToCString(DISALLOW_NULLS); |
| 1639 | const char* elms[2] = { "Label", *c_string }; |
| 1640 | Vector<const char*> args(elms, 2); |
| 1641 | ReportMessage("redeclaration", args); |
| 1642 | *ok = false; |
| 1643 | return NULL; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1644 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1645 | if (labels == NULL) labels = new ZoneStringList(4); |
| 1646 | labels->Add(label); |
| 1647 | // Remove the "ghost" variable that turned out to be a label |
| 1648 | // from the top scope. This way, we don't try to resolve it |
| 1649 | // during the scope processing. |
| 1650 | top_scope_->RemoveUnresolved(var); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1651 | Expect(Token::COLON, CHECK_OK); |
| 1652 | return ParseStatement(labels, ok); |
| 1653 | } |
| 1654 | |
| 1655 | // Parsed expression statement. |
| 1656 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1657 | return new ExpressionStatement(expr); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1658 | } |
| 1659 | |
| 1660 | |
| 1661 | IfStatement* Parser::ParseIfStatement(ZoneStringList* labels, bool* ok) { |
| 1662 | // IfStatement :: |
| 1663 | // 'if' '(' Expression ')' Statement ('else' Statement)? |
| 1664 | |
| 1665 | Expect(Token::IF, CHECK_OK); |
| 1666 | Expect(Token::LPAREN, CHECK_OK); |
| 1667 | Expression* condition = ParseExpression(true, CHECK_OK); |
| 1668 | Expect(Token::RPAREN, CHECK_OK); |
| 1669 | Statement* then_statement = ParseStatement(labels, CHECK_OK); |
| 1670 | Statement* else_statement = NULL; |
| 1671 | if (peek() == Token::ELSE) { |
| 1672 | Next(); |
| 1673 | else_statement = ParseStatement(labels, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1674 | } else { |
| 1675 | else_statement = EmptyStatement(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1676 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1677 | return new IfStatement(condition, then_statement, else_statement); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1678 | } |
| 1679 | |
| 1680 | |
| 1681 | Statement* Parser::ParseContinueStatement(bool* ok) { |
| 1682 | // ContinueStatement :: |
| 1683 | // 'continue' Identifier? ';' |
| 1684 | |
| 1685 | Expect(Token::CONTINUE, CHECK_OK); |
| 1686 | Handle<String> label = Handle<String>::null(); |
| 1687 | Token::Value tok = peek(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1688 | if (!scanner().has_line_terminator_before_next() && |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1689 | tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) { |
| 1690 | label = ParseIdentifier(CHECK_OK); |
| 1691 | } |
| 1692 | IterationStatement* target = NULL; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1693 | target = LookupContinueTarget(label, CHECK_OK); |
| 1694 | if (target == NULL) { |
| 1695 | // Illegal continue statement. To be consistent with KJS we delay |
| 1696 | // reporting of the syntax error until runtime. |
| 1697 | Handle<String> error_type = Factory::illegal_continue_symbol(); |
| 1698 | if (!label.is_null()) error_type = Factory::unknown_label_symbol(); |
| 1699 | Expression* throw_error = NewThrowSyntaxError(error_type, label); |
| 1700 | return new ExpressionStatement(throw_error); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1701 | } |
| 1702 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1703 | return new ContinueStatement(target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1704 | } |
| 1705 | |
| 1706 | |
| 1707 | Statement* Parser::ParseBreakStatement(ZoneStringList* labels, bool* ok) { |
| 1708 | // BreakStatement :: |
| 1709 | // 'break' Identifier? ';' |
| 1710 | |
| 1711 | Expect(Token::BREAK, CHECK_OK); |
| 1712 | Handle<String> label; |
| 1713 | Token::Value tok = peek(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1714 | if (!scanner().has_line_terminator_before_next() && |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1715 | tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) { |
| 1716 | label = ParseIdentifier(CHECK_OK); |
| 1717 | } |
| 1718 | // Parse labeled break statements that target themselves into |
| 1719 | // empty statements, e.g. 'l1: l2: l3: break l2;' |
| 1720 | if (!label.is_null() && ContainsLabel(labels, label)) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1721 | return EmptyStatement(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1722 | } |
| 1723 | BreakableStatement* target = NULL; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1724 | target = LookupBreakTarget(label, CHECK_OK); |
| 1725 | if (target == NULL) { |
| 1726 | // Illegal break statement. To be consistent with KJS we delay |
| 1727 | // reporting of the syntax error until runtime. |
| 1728 | Handle<String> error_type = Factory::illegal_break_symbol(); |
| 1729 | if (!label.is_null()) error_type = Factory::unknown_label_symbol(); |
| 1730 | Expression* throw_error = NewThrowSyntaxError(error_type, label); |
| 1731 | return new ExpressionStatement(throw_error); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1732 | } |
| 1733 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1734 | return new BreakStatement(target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1735 | } |
| 1736 | |
| 1737 | |
| 1738 | Statement* Parser::ParseReturnStatement(bool* ok) { |
| 1739 | // ReturnStatement :: |
| 1740 | // 'return' Expression? ';' |
| 1741 | |
| 1742 | // Consume the return token. It is necessary to do the before |
| 1743 | // reporting any errors on it, because of the way errors are |
| 1744 | // reported (underlining). |
| 1745 | Expect(Token::RETURN, CHECK_OK); |
| 1746 | |
| 1747 | // An ECMAScript program is considered syntactically incorrect if it |
| 1748 | // contains a return statement that is not within the body of a |
| 1749 | // function. See ECMA-262, section 12.9, page 67. |
| 1750 | // |
| 1751 | // To be consistent with KJS we report the syntax error at runtime. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1752 | if (!top_scope_->is_function_scope()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1753 | Handle<String> type = Factory::illegal_return_symbol(); |
| 1754 | Expression* throw_error = NewThrowSyntaxError(type, Handle<Object>::null()); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1755 | return new ExpressionStatement(throw_error); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1756 | } |
| 1757 | |
| 1758 | Token::Value tok = peek(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1759 | if (scanner().has_line_terminator_before_next() || |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1760 | tok == Token::SEMICOLON || |
| 1761 | tok == Token::RBRACE || |
| 1762 | tok == Token::EOS) { |
| 1763 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1764 | return new ReturnStatement(GetLiteralUndefined()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1765 | } |
| 1766 | |
| 1767 | Expression* expr = ParseExpression(true, CHECK_OK); |
| 1768 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1769 | return new ReturnStatement(expr); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1770 | } |
| 1771 | |
| 1772 | |
| 1773 | Block* Parser::WithHelper(Expression* obj, |
| 1774 | ZoneStringList* labels, |
| 1775 | bool is_catch_block, |
| 1776 | bool* ok) { |
| 1777 | // Parse the statement and collect escaping labels. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1778 | ZoneList<BreakTarget*>* target_list = new ZoneList<BreakTarget*>(0); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1779 | TargetCollector collector(target_list); |
| 1780 | Statement* stat; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1781 | { Target target(&this->target_stack_, &collector); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1782 | with_nesting_level_++; |
| 1783 | top_scope_->RecordWithStatement(); |
| 1784 | stat = ParseStatement(labels, CHECK_OK); |
| 1785 | with_nesting_level_--; |
| 1786 | } |
| 1787 | // Create resulting block with two statements. |
| 1788 | // 1: Evaluate the with expression. |
| 1789 | // 2: The try-finally block evaluating the body. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1790 | Block* result = new Block(NULL, 2, false); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1791 | |
| 1792 | if (result != NULL) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1793 | result->AddStatement(new WithEnterStatement(obj, is_catch_block)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1794 | |
| 1795 | // Create body block. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1796 | Block* body = new Block(NULL, 1, false); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1797 | body->AddStatement(stat); |
| 1798 | |
| 1799 | // Create exit block. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1800 | Block* exit = new Block(NULL, 1, false); |
| 1801 | exit->AddStatement(new WithExitStatement()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1802 | |
| 1803 | // Return a try-finally statement. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1804 | TryFinallyStatement* wrapper = new TryFinallyStatement(body, exit); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1805 | wrapper->set_escaping_targets(collector.targets()); |
| 1806 | result->AddStatement(wrapper); |
| 1807 | } |
| 1808 | return result; |
| 1809 | } |
| 1810 | |
| 1811 | |
| 1812 | Statement* Parser::ParseWithStatement(ZoneStringList* labels, bool* ok) { |
| 1813 | // WithStatement :: |
| 1814 | // 'with' '(' Expression ')' Statement |
| 1815 | |
| 1816 | Expect(Token::WITH, CHECK_OK); |
| 1817 | Expect(Token::LPAREN, CHECK_OK); |
| 1818 | Expression* expr = ParseExpression(true, CHECK_OK); |
| 1819 | Expect(Token::RPAREN, CHECK_OK); |
| 1820 | |
| 1821 | return WithHelper(expr, labels, false, CHECK_OK); |
| 1822 | } |
| 1823 | |
| 1824 | |
| 1825 | CaseClause* Parser::ParseCaseClause(bool* default_seen_ptr, bool* ok) { |
| 1826 | // CaseClause :: |
| 1827 | // 'case' Expression ':' Statement* |
| 1828 | // 'default' ':' Statement* |
| 1829 | |
| 1830 | Expression* label = NULL; // NULL expression indicates default case |
| 1831 | if (peek() == Token::CASE) { |
| 1832 | Expect(Token::CASE, CHECK_OK); |
| 1833 | label = ParseExpression(true, CHECK_OK); |
| 1834 | } else { |
| 1835 | Expect(Token::DEFAULT, CHECK_OK); |
| 1836 | if (*default_seen_ptr) { |
| 1837 | ReportMessage("multiple_defaults_in_switch", |
| 1838 | Vector<const char*>::empty()); |
| 1839 | *ok = false; |
| 1840 | return NULL; |
| 1841 | } |
| 1842 | *default_seen_ptr = true; |
| 1843 | } |
| 1844 | Expect(Token::COLON, CHECK_OK); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1845 | int pos = scanner().location().beg_pos; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1846 | ZoneList<Statement*>* statements = new ZoneList<Statement*>(5); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1847 | while (peek() != Token::CASE && |
| 1848 | peek() != Token::DEFAULT && |
| 1849 | peek() != Token::RBRACE) { |
| 1850 | Statement* stat = ParseStatement(NULL, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1851 | statements->Add(stat); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1852 | } |
| 1853 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1854 | return new CaseClause(label, statements, pos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1855 | } |
| 1856 | |
| 1857 | |
| 1858 | SwitchStatement* Parser::ParseSwitchStatement(ZoneStringList* labels, |
| 1859 | bool* ok) { |
| 1860 | // SwitchStatement :: |
| 1861 | // 'switch' '(' Expression ')' '{' CaseClause* '}' |
| 1862 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1863 | SwitchStatement* statement = new SwitchStatement(labels); |
| 1864 | Target target(&this->target_stack_, statement); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1865 | |
| 1866 | Expect(Token::SWITCH, CHECK_OK); |
| 1867 | Expect(Token::LPAREN, CHECK_OK); |
| 1868 | Expression* tag = ParseExpression(true, CHECK_OK); |
| 1869 | Expect(Token::RPAREN, CHECK_OK); |
| 1870 | |
| 1871 | bool default_seen = false; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1872 | ZoneList<CaseClause*>* cases = new ZoneList<CaseClause*>(4); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1873 | Expect(Token::LBRACE, CHECK_OK); |
| 1874 | while (peek() != Token::RBRACE) { |
| 1875 | CaseClause* clause = ParseCaseClause(&default_seen, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1876 | cases->Add(clause); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1877 | } |
| 1878 | Expect(Token::RBRACE, CHECK_OK); |
| 1879 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1880 | if (statement) statement->Initialize(tag, cases); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1881 | return statement; |
| 1882 | } |
| 1883 | |
| 1884 | |
| 1885 | Statement* Parser::ParseThrowStatement(bool* ok) { |
| 1886 | // ThrowStatement :: |
| 1887 | // 'throw' Expression ';' |
| 1888 | |
| 1889 | Expect(Token::THROW, CHECK_OK); |
| 1890 | int pos = scanner().location().beg_pos; |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1891 | if (scanner().has_line_terminator_before_next()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1892 | ReportMessage("newline_after_throw", Vector<const char*>::empty()); |
| 1893 | *ok = false; |
| 1894 | return NULL; |
| 1895 | } |
| 1896 | Expression* exception = ParseExpression(true, CHECK_OK); |
| 1897 | ExpectSemicolon(CHECK_OK); |
| 1898 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1899 | return new ExpressionStatement(new Throw(exception, pos)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1900 | } |
| 1901 | |
| 1902 | |
| 1903 | TryStatement* Parser::ParseTryStatement(bool* ok) { |
| 1904 | // TryStatement :: |
| 1905 | // 'try' Block Catch |
| 1906 | // 'try' Block Finally |
| 1907 | // 'try' Block Catch Finally |
| 1908 | // |
| 1909 | // Catch :: |
| 1910 | // 'catch' '(' Identifier ')' Block |
| 1911 | // |
| 1912 | // Finally :: |
| 1913 | // 'finally' Block |
| 1914 | |
| 1915 | Expect(Token::TRY, CHECK_OK); |
| 1916 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1917 | ZoneList<BreakTarget*>* target_list = new ZoneList<BreakTarget*>(0); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1918 | TargetCollector collector(target_list); |
| 1919 | Block* try_block; |
| 1920 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1921 | { Target target(&this->target_stack_, &collector); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1922 | try_block = ParseBlock(NULL, CHECK_OK); |
| 1923 | } |
| 1924 | |
| 1925 | Block* catch_block = NULL; |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1926 | Variable* catch_var = NULL; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1927 | Block* finally_block = NULL; |
| 1928 | |
| 1929 | Token::Value tok = peek(); |
| 1930 | if (tok != Token::CATCH && tok != Token::FINALLY) { |
| 1931 | ReportMessage("no_catch_or_finally", Vector<const char*>::empty()); |
| 1932 | *ok = false; |
| 1933 | return NULL; |
| 1934 | } |
| 1935 | |
| 1936 | // If we can break out from the catch block and there is a finally block, |
| 1937 | // then we will need to collect jump targets from the catch block. Since |
| 1938 | // we don't know yet if there will be a finally block, we always collect |
| 1939 | // the jump targets. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1940 | ZoneList<BreakTarget*>* catch_target_list = new ZoneList<BreakTarget*>(0); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1941 | TargetCollector catch_collector(catch_target_list); |
| 1942 | bool has_catch = false; |
| 1943 | if (tok == Token::CATCH) { |
| 1944 | has_catch = true; |
| 1945 | Consume(Token::CATCH); |
| 1946 | |
| 1947 | Expect(Token::LPAREN, CHECK_OK); |
| 1948 | Handle<String> name = ParseIdentifier(CHECK_OK); |
| 1949 | Expect(Token::RPAREN, CHECK_OK); |
| 1950 | |
| 1951 | if (peek() == Token::LBRACE) { |
| 1952 | // Allocate a temporary for holding the finally state while |
| 1953 | // executing the finally block. |
| 1954 | catch_var = top_scope_->NewTemporary(Factory::catch_var_symbol()); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1955 | Literal* name_literal = new Literal(name); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1956 | VariableProxy* catch_var_use = new VariableProxy(catch_var); |
| 1957 | Expression* obj = new CatchExtensionObject(name_literal, catch_var_use); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1958 | { Target target(&this->target_stack_, &catch_collector); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1959 | catch_block = WithHelper(obj, NULL, true, CHECK_OK); |
| 1960 | } |
| 1961 | } else { |
| 1962 | Expect(Token::LBRACE, CHECK_OK); |
| 1963 | } |
| 1964 | |
| 1965 | tok = peek(); |
| 1966 | } |
| 1967 | |
| 1968 | if (tok == Token::FINALLY || !has_catch) { |
| 1969 | Consume(Token::FINALLY); |
| 1970 | // Declare a variable for holding the finally state while |
| 1971 | // executing the finally block. |
| 1972 | finally_block = ParseBlock(NULL, CHECK_OK); |
| 1973 | } |
| 1974 | |
| 1975 | // Simplify the AST nodes by converting: |
| 1976 | // 'try { } catch { } finally { }' |
| 1977 | // to: |
| 1978 | // 'try { try { } catch { } } finally { }' |
| 1979 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1980 | if (catch_block != NULL && finally_block != NULL) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1981 | VariableProxy* catch_var_defn = new VariableProxy(catch_var); |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1982 | TryCatchStatement* statement = |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1983 | new TryCatchStatement(try_block, catch_var_defn, catch_block); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1984 | statement->set_escaping_targets(collector.targets()); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1985 | try_block = new Block(NULL, 1, false); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1986 | try_block->AddStatement(statement); |
| 1987 | catch_block = NULL; |
| 1988 | } |
| 1989 | |
| 1990 | TryStatement* result = NULL; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1991 | if (catch_block != NULL) { |
| 1992 | ASSERT(finally_block == NULL); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1993 | VariableProxy* catch_var_defn = new VariableProxy(catch_var); |
| 1994 | result = new TryCatchStatement(try_block, catch_var_defn, catch_block); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 1995 | result->set_escaping_targets(collector.targets()); |
| 1996 | } else { |
| 1997 | ASSERT(finally_block != NULL); |
| 1998 | result = new TryFinallyStatement(try_block, finally_block); |
| 1999 | // Add the jump targets of the try block and the catch block. |
| 2000 | for (int i = 0; i < collector.targets()->length(); i++) { |
| 2001 | catch_collector.AddTarget(collector.targets()->at(i)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2002 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2003 | result->set_escaping_targets(catch_collector.targets()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2004 | } |
| 2005 | |
| 2006 | return result; |
| 2007 | } |
| 2008 | |
| 2009 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 2010 | DoWhileStatement* Parser::ParseDoWhileStatement(ZoneStringList* labels, |
| 2011 | bool* ok) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2012 | // DoStatement :: |
| 2013 | // 'do' Statement 'while' '(' Expression ')' ';' |
| 2014 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2015 | temp_scope_->AddLoop(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2016 | DoWhileStatement* loop = new DoWhileStatement(labels); |
| 2017 | Target target(&this->target_stack_, loop); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2018 | |
| 2019 | Expect(Token::DO, CHECK_OK); |
| 2020 | Statement* body = ParseStatement(NULL, CHECK_OK); |
| 2021 | Expect(Token::WHILE, CHECK_OK); |
| 2022 | Expect(Token::LPAREN, CHECK_OK); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2023 | |
| 2024 | if (loop != NULL) { |
| 2025 | int position = scanner().location().beg_pos; |
| 2026 | loop->set_condition_position(position); |
| 2027 | } |
| 2028 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2029 | Expression* cond = ParseExpression(true, CHECK_OK); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2030 | if (cond != NULL) cond->set_is_loop_condition(true); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2031 | Expect(Token::RPAREN, CHECK_OK); |
| 2032 | |
| 2033 | // Allow do-statements to be terminated with and without |
| 2034 | // semi-colons. This allows code such as 'do;while(0)return' to |
| 2035 | // parse, which would not be the case if we had used the |
| 2036 | // ExpectSemicolon() functionality here. |
| 2037 | if (peek() == Token::SEMICOLON) Consume(Token::SEMICOLON); |
| 2038 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 2039 | if (loop != NULL) loop->Initialize(cond, body); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2040 | return loop; |
| 2041 | } |
| 2042 | |
| 2043 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 2044 | WhileStatement* Parser::ParseWhileStatement(ZoneStringList* labels, bool* ok) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2045 | // WhileStatement :: |
| 2046 | // 'while' '(' Expression ')' Statement |
| 2047 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2048 | temp_scope_->AddLoop(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2049 | WhileStatement* loop = new WhileStatement(labels); |
| 2050 | Target target(&this->target_stack_, loop); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2051 | |
| 2052 | Expect(Token::WHILE, CHECK_OK); |
| 2053 | Expect(Token::LPAREN, CHECK_OK); |
| 2054 | Expression* cond = ParseExpression(true, CHECK_OK); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2055 | if (cond != NULL) cond->set_is_loop_condition(true); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2056 | Expect(Token::RPAREN, CHECK_OK); |
| 2057 | Statement* body = ParseStatement(NULL, CHECK_OK); |
| 2058 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 2059 | if (loop != NULL) loop->Initialize(cond, body); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2060 | return loop; |
| 2061 | } |
| 2062 | |
| 2063 | |
| 2064 | Statement* Parser::ParseForStatement(ZoneStringList* labels, bool* ok) { |
| 2065 | // ForStatement :: |
| 2066 | // 'for' '(' Expression? ';' Expression? ';' Expression? ')' Statement |
| 2067 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2068 | temp_scope_->AddLoop(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2069 | Statement* init = NULL; |
| 2070 | |
| 2071 | Expect(Token::FOR, CHECK_OK); |
| 2072 | Expect(Token::LPAREN, CHECK_OK); |
| 2073 | if (peek() != Token::SEMICOLON) { |
| 2074 | if (peek() == Token::VAR || peek() == Token::CONST) { |
| 2075 | Expression* each = NULL; |
| 2076 | Block* variable_statement = |
| 2077 | ParseVariableDeclarations(false, &each, CHECK_OK); |
| 2078 | if (peek() == Token::IN && each != NULL) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2079 | ForInStatement* loop = new ForInStatement(labels); |
| 2080 | Target target(&this->target_stack_, loop); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2081 | |
| 2082 | Expect(Token::IN, CHECK_OK); |
| 2083 | Expression* enumerable = ParseExpression(true, CHECK_OK); |
| 2084 | Expect(Token::RPAREN, CHECK_OK); |
| 2085 | |
| 2086 | Statement* body = ParseStatement(NULL, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2087 | loop->Initialize(each, enumerable, body); |
| 2088 | Block* result = new Block(NULL, 2, false); |
| 2089 | result->AddStatement(variable_statement); |
| 2090 | result->AddStatement(loop); |
| 2091 | // Parsed for-in loop w/ variable/const declaration. |
| 2092 | return result; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2093 | } else { |
| 2094 | init = variable_statement; |
| 2095 | } |
| 2096 | |
| 2097 | } else { |
| 2098 | Expression* expression = ParseExpression(false, CHECK_OK); |
| 2099 | if (peek() == Token::IN) { |
| 2100 | // Signal a reference error if the expression is an invalid |
| 2101 | // left-hand side expression. We could report this as a syntax |
| 2102 | // error here but for compatibility with JSC we choose to report |
| 2103 | // the error at runtime. |
| 2104 | if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| 2105 | Handle<String> type = Factory::invalid_lhs_in_for_in_symbol(); |
| 2106 | expression = NewThrowReferenceError(type); |
| 2107 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2108 | ForInStatement* loop = new ForInStatement(labels); |
| 2109 | Target target(&this->target_stack_, loop); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2110 | |
| 2111 | Expect(Token::IN, CHECK_OK); |
| 2112 | Expression* enumerable = ParseExpression(true, CHECK_OK); |
| 2113 | Expect(Token::RPAREN, CHECK_OK); |
| 2114 | |
| 2115 | Statement* body = ParseStatement(NULL, CHECK_OK); |
| 2116 | if (loop) loop->Initialize(expression, enumerable, body); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2117 | // Parsed for-in loop. |
| 2118 | return loop; |
| 2119 | |
| 2120 | } else { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2121 | init = new ExpressionStatement(expression); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2122 | } |
| 2123 | } |
| 2124 | } |
| 2125 | |
| 2126 | // Standard 'for' loop |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2127 | ForStatement* loop = new ForStatement(labels); |
| 2128 | Target target(&this->target_stack_, loop); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2129 | |
| 2130 | // Parsed initializer at this point. |
| 2131 | Expect(Token::SEMICOLON, CHECK_OK); |
| 2132 | |
| 2133 | Expression* cond = NULL; |
| 2134 | if (peek() != Token::SEMICOLON) { |
| 2135 | cond = ParseExpression(true, CHECK_OK); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2136 | if (cond != NULL) cond->set_is_loop_condition(true); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2137 | } |
| 2138 | Expect(Token::SEMICOLON, CHECK_OK); |
| 2139 | |
| 2140 | Statement* next = NULL; |
| 2141 | if (peek() != Token::RPAREN) { |
| 2142 | Expression* exp = ParseExpression(true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2143 | next = new ExpressionStatement(exp); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2144 | } |
| 2145 | Expect(Token::RPAREN, CHECK_OK); |
| 2146 | |
| 2147 | Statement* body = ParseStatement(NULL, CHECK_OK); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2148 | if (loop) loop->Initialize(init, cond, next, body); |
| 2149 | return loop; |
| 2150 | } |
| 2151 | |
| 2152 | |
| 2153 | // Precedence = 1 |
| 2154 | Expression* Parser::ParseExpression(bool accept_IN, bool* ok) { |
| 2155 | // Expression :: |
| 2156 | // AssignmentExpression |
| 2157 | // Expression ',' AssignmentExpression |
| 2158 | |
| 2159 | Expression* result = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 2160 | while (peek() == Token::COMMA) { |
| 2161 | Expect(Token::COMMA, CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2162 | int position = scanner().location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2163 | Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2164 | result = new BinaryOperation(Token::COMMA, result, right, position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2165 | } |
| 2166 | return result; |
| 2167 | } |
| 2168 | |
| 2169 | |
| 2170 | // Precedence = 2 |
| 2171 | Expression* Parser::ParseAssignmentExpression(bool accept_IN, bool* ok) { |
| 2172 | // AssignmentExpression :: |
| 2173 | // ConditionalExpression |
| 2174 | // LeftHandSideExpression AssignmentOperator AssignmentExpression |
| 2175 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2176 | if (fni_ != NULL) fni_->Enter(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2177 | Expression* expression = ParseConditionalExpression(accept_IN, CHECK_OK); |
| 2178 | |
| 2179 | if (!Token::IsAssignmentOp(peek())) { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2180 | if (fni_ != NULL) fni_->Leave(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2181 | // Parsed conditional expression only (no assignment). |
| 2182 | return expression; |
| 2183 | } |
| 2184 | |
| 2185 | // Signal a reference error if the expression is an invalid left-hand |
| 2186 | // side expression. We could report this as a syntax error here but |
| 2187 | // for compatibility with JSC we choose to report the error at |
| 2188 | // runtime. |
| 2189 | if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| 2190 | Handle<String> type = Factory::invalid_lhs_in_assignment_symbol(); |
| 2191 | expression = NewThrowReferenceError(type); |
| 2192 | } |
| 2193 | |
| 2194 | Token::Value op = Next(); // Get assignment operator. |
| 2195 | int pos = scanner().location().beg_pos; |
| 2196 | Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 2197 | |
| 2198 | // TODO(1231235): We try to estimate the set of properties set by |
| 2199 | // constructors. We define a new property whenever there is an |
| 2200 | // assignment to a property of 'this'. We should probably only add |
| 2201 | // properties if we haven't seen them before. Otherwise we'll |
| 2202 | // probably overestimate the number of properties. |
| 2203 | Property* property = expression ? expression->AsProperty() : NULL; |
| 2204 | if (op == Token::ASSIGN && |
| 2205 | property != NULL && |
| 2206 | property->obj()->AsVariableProxy() != NULL && |
| 2207 | property->obj()->AsVariableProxy()->is_this()) { |
| 2208 | temp_scope_->AddProperty(); |
| 2209 | } |
| 2210 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 2211 | // If we assign a function literal to a property we pretenure the |
| 2212 | // literal so it can be added as a constant function property. |
| 2213 | if (property != NULL && right->AsFunctionLiteral() != NULL) { |
| 2214 | right->AsFunctionLiteral()->set_pretenure(true); |
| 2215 | } |
| 2216 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2217 | if (fni_ != NULL) { |
| 2218 | // Check if the right hand side is a call to avoid inferring a |
| 2219 | // name if we're dealing with "a = function(){...}();"-like |
| 2220 | // expression. |
| 2221 | if ((op == Token::INIT_VAR |
| 2222 | || op == Token::INIT_CONST |
| 2223 | || op == Token::ASSIGN) |
| 2224 | && (right->AsCall() == NULL)) { |
| 2225 | fni_->Infer(); |
| 2226 | } |
| 2227 | fni_->Leave(); |
| 2228 | } |
| 2229 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2230 | return new Assignment(op, expression, right, pos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2231 | } |
| 2232 | |
| 2233 | |
| 2234 | // Precedence = 3 |
| 2235 | Expression* Parser::ParseConditionalExpression(bool accept_IN, bool* ok) { |
| 2236 | // ConditionalExpression :: |
| 2237 | // LogicalOrExpression |
| 2238 | // LogicalOrExpression '?' AssignmentExpression ':' AssignmentExpression |
| 2239 | |
| 2240 | // We start using the binary expression parser for prec >= 4 only! |
| 2241 | Expression* expression = ParseBinaryExpression(4, accept_IN, CHECK_OK); |
| 2242 | if (peek() != Token::CONDITIONAL) return expression; |
| 2243 | Consume(Token::CONDITIONAL); |
| 2244 | // In parsing the first assignment expression in conditional |
| 2245 | // expressions we always accept the 'in' keyword; see ECMA-262, |
| 2246 | // section 11.12, page 58. |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 2247 | int left_position = scanner().peek_location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2248 | Expression* left = ParseAssignmentExpression(true, CHECK_OK); |
| 2249 | Expect(Token::COLON, CHECK_OK); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 2250 | int right_position = scanner().peek_location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2251 | Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2252 | return new Conditional(expression, left, right, |
| 2253 | left_position, right_position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2254 | } |
| 2255 | |
| 2256 | |
| 2257 | static int Precedence(Token::Value tok, bool accept_IN) { |
| 2258 | if (tok == Token::IN && !accept_IN) |
| 2259 | return 0; // 0 precedence will terminate binary expression parsing |
| 2260 | |
| 2261 | return Token::Precedence(tok); |
| 2262 | } |
| 2263 | |
| 2264 | |
| 2265 | // Precedence >= 4 |
| 2266 | Expression* Parser::ParseBinaryExpression(int prec, bool accept_IN, bool* ok) { |
| 2267 | ASSERT(prec >= 4); |
| 2268 | Expression* x = ParseUnaryExpression(CHECK_OK); |
| 2269 | for (int prec1 = Precedence(peek(), accept_IN); prec1 >= prec; prec1--) { |
| 2270 | // prec1 >= 4 |
| 2271 | while (Precedence(peek(), accept_IN) == prec1) { |
| 2272 | Token::Value op = Next(); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2273 | int position = scanner().location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2274 | Expression* y = ParseBinaryExpression(prec1 + 1, accept_IN, CHECK_OK); |
| 2275 | |
| 2276 | // Compute some expressions involving only number literals. |
| 2277 | if (x && x->AsLiteral() && x->AsLiteral()->handle()->IsNumber() && |
| 2278 | y && y->AsLiteral() && y->AsLiteral()->handle()->IsNumber()) { |
| 2279 | double x_val = x->AsLiteral()->handle()->Number(); |
| 2280 | double y_val = y->AsLiteral()->handle()->Number(); |
| 2281 | |
| 2282 | switch (op) { |
| 2283 | case Token::ADD: |
| 2284 | x = NewNumberLiteral(x_val + y_val); |
| 2285 | continue; |
| 2286 | case Token::SUB: |
| 2287 | x = NewNumberLiteral(x_val - y_val); |
| 2288 | continue; |
| 2289 | case Token::MUL: |
| 2290 | x = NewNumberLiteral(x_val * y_val); |
| 2291 | continue; |
| 2292 | case Token::DIV: |
| 2293 | x = NewNumberLiteral(x_val / y_val); |
| 2294 | continue; |
| 2295 | case Token::BIT_OR: |
| 2296 | x = NewNumberLiteral(DoubleToInt32(x_val) | DoubleToInt32(y_val)); |
| 2297 | continue; |
| 2298 | case Token::BIT_AND: |
| 2299 | x = NewNumberLiteral(DoubleToInt32(x_val) & DoubleToInt32(y_val)); |
| 2300 | continue; |
| 2301 | case Token::BIT_XOR: |
| 2302 | x = NewNumberLiteral(DoubleToInt32(x_val) ^ DoubleToInt32(y_val)); |
| 2303 | continue; |
| 2304 | case Token::SHL: { |
| 2305 | int value = DoubleToInt32(x_val) << (DoubleToInt32(y_val) & 0x1f); |
| 2306 | x = NewNumberLiteral(value); |
| 2307 | continue; |
| 2308 | } |
| 2309 | case Token::SHR: { |
| 2310 | uint32_t shift = DoubleToInt32(y_val) & 0x1f; |
| 2311 | uint32_t value = DoubleToUint32(x_val) >> shift; |
| 2312 | x = NewNumberLiteral(value); |
| 2313 | continue; |
| 2314 | } |
| 2315 | case Token::SAR: { |
| 2316 | uint32_t shift = DoubleToInt32(y_val) & 0x1f; |
| 2317 | int value = ArithmeticShiftRight(DoubleToInt32(x_val), shift); |
| 2318 | x = NewNumberLiteral(value); |
| 2319 | continue; |
| 2320 | } |
| 2321 | default: |
| 2322 | break; |
| 2323 | } |
| 2324 | } |
| 2325 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2326 | // For now we distinguish between comparisons and other binary |
| 2327 | // operations. (We could combine the two and get rid of this |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2328 | // code and AST node eventually.) |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2329 | if (Token::IsCompareOp(op)) { |
| 2330 | // We have a comparison. |
| 2331 | Token::Value cmp = op; |
| 2332 | switch (op) { |
| 2333 | case Token::NE: cmp = Token::EQ; break; |
| 2334 | case Token::NE_STRICT: cmp = Token::EQ_STRICT; break; |
| 2335 | default: break; |
| 2336 | } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2337 | x = NewCompareNode(cmp, x, y, position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2338 | if (cmp != op) { |
| 2339 | // The comparison was negated - add a NOT. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2340 | x = new UnaryOperation(Token::NOT, x); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2341 | } |
| 2342 | |
| 2343 | } else { |
| 2344 | // We have a "normal" binary operation. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2345 | x = new BinaryOperation(op, x, y, position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2346 | } |
| 2347 | } |
| 2348 | } |
| 2349 | return x; |
| 2350 | } |
| 2351 | |
| 2352 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2353 | Expression* Parser::NewCompareNode(Token::Value op, |
| 2354 | Expression* x, |
| 2355 | Expression* y, |
| 2356 | int position) { |
| 2357 | ASSERT(op != Token::NE && op != Token::NE_STRICT); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2358 | if (op == Token::EQ || op == Token::EQ_STRICT) { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2359 | bool is_strict = (op == Token::EQ_STRICT); |
| 2360 | Literal* x_literal = x->AsLiteral(); |
| 2361 | if (x_literal != NULL && x_literal->IsNull()) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2362 | return new CompareToNull(is_strict, y); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2363 | } |
| 2364 | |
| 2365 | Literal* y_literal = y->AsLiteral(); |
| 2366 | if (y_literal != NULL && y_literal->IsNull()) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2367 | return new CompareToNull(is_strict, x); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2368 | } |
| 2369 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2370 | return new CompareOperation(op, x, y, position); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2371 | } |
| 2372 | |
| 2373 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2374 | Expression* Parser::ParseUnaryExpression(bool* ok) { |
| 2375 | // UnaryExpression :: |
| 2376 | // PostfixExpression |
| 2377 | // 'delete' UnaryExpression |
| 2378 | // 'void' UnaryExpression |
| 2379 | // 'typeof' UnaryExpression |
| 2380 | // '++' UnaryExpression |
| 2381 | // '--' UnaryExpression |
| 2382 | // '+' UnaryExpression |
| 2383 | // '-' UnaryExpression |
| 2384 | // '~' UnaryExpression |
| 2385 | // '!' UnaryExpression |
| 2386 | |
| 2387 | Token::Value op = peek(); |
| 2388 | if (Token::IsUnaryOp(op)) { |
| 2389 | op = Next(); |
| 2390 | Expression* expression = ParseUnaryExpression(CHECK_OK); |
| 2391 | |
| 2392 | // Compute some expressions involving only number literals. |
| 2393 | if (expression != NULL && expression->AsLiteral() && |
| 2394 | expression->AsLiteral()->handle()->IsNumber()) { |
| 2395 | double value = expression->AsLiteral()->handle()->Number(); |
| 2396 | switch (op) { |
| 2397 | case Token::ADD: |
| 2398 | return expression; |
| 2399 | case Token::SUB: |
| 2400 | return NewNumberLiteral(-value); |
| 2401 | case Token::BIT_NOT: |
| 2402 | return NewNumberLiteral(~DoubleToInt32(value)); |
| 2403 | default: break; |
| 2404 | } |
| 2405 | } |
| 2406 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2407 | return new UnaryOperation(op, expression); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2408 | |
| 2409 | } else if (Token::IsCountOp(op)) { |
| 2410 | op = Next(); |
| 2411 | Expression* expression = ParseUnaryExpression(CHECK_OK); |
| 2412 | // Signal a reference error if the expression is an invalid |
| 2413 | // left-hand side expression. We could report this as a syntax |
| 2414 | // error here but for compatibility with JSC we choose to report the |
| 2415 | // error at runtime. |
| 2416 | if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| 2417 | Handle<String> type = Factory::invalid_lhs_in_prefix_op_symbol(); |
| 2418 | expression = NewThrowReferenceError(type); |
| 2419 | } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2420 | int position = scanner().location().beg_pos; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2421 | IncrementOperation* increment = new IncrementOperation(op, expression); |
| 2422 | return new CountOperation(true /* prefix */, increment, position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2423 | |
| 2424 | } else { |
| 2425 | return ParsePostfixExpression(ok); |
| 2426 | } |
| 2427 | } |
| 2428 | |
| 2429 | |
| 2430 | Expression* Parser::ParsePostfixExpression(bool* ok) { |
| 2431 | // PostfixExpression :: |
| 2432 | // LeftHandSideExpression ('++' | '--')? |
| 2433 | |
| 2434 | Expression* expression = ParseLeftHandSideExpression(CHECK_OK); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2435 | if (!scanner().has_line_terminator_before_next() && |
| 2436 | Token::IsCountOp(peek())) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2437 | // Signal a reference error if the expression is an invalid |
| 2438 | // left-hand side expression. We could report this as a syntax |
| 2439 | // error here but for compatibility with JSC we choose to report the |
| 2440 | // error at runtime. |
| 2441 | if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| 2442 | Handle<String> type = Factory::invalid_lhs_in_postfix_op_symbol(); |
| 2443 | expression = NewThrowReferenceError(type); |
| 2444 | } |
| 2445 | Token::Value next = Next(); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2446 | int position = scanner().location().beg_pos; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2447 | IncrementOperation* increment = new IncrementOperation(next, expression); |
| 2448 | expression = new CountOperation(false /* postfix */, increment, position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2449 | } |
| 2450 | return expression; |
| 2451 | } |
| 2452 | |
| 2453 | |
| 2454 | Expression* Parser::ParseLeftHandSideExpression(bool* ok) { |
| 2455 | // LeftHandSideExpression :: |
| 2456 | // (NewExpression | MemberExpression) ... |
| 2457 | |
| 2458 | Expression* result; |
| 2459 | if (peek() == Token::NEW) { |
| 2460 | result = ParseNewExpression(CHECK_OK); |
| 2461 | } else { |
| 2462 | result = ParseMemberExpression(CHECK_OK); |
| 2463 | } |
| 2464 | |
| 2465 | while (true) { |
| 2466 | switch (peek()) { |
| 2467 | case Token::LBRACK: { |
| 2468 | Consume(Token::LBRACK); |
| 2469 | int pos = scanner().location().beg_pos; |
| 2470 | Expression* index = ParseExpression(true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2471 | result = new Property(result, index, pos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2472 | Expect(Token::RBRACK, CHECK_OK); |
| 2473 | break; |
| 2474 | } |
| 2475 | |
| 2476 | case Token::LPAREN: { |
| 2477 | int pos = scanner().location().beg_pos; |
| 2478 | ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
| 2479 | |
| 2480 | // Keep track of eval() calls since they disable all local variable |
| 2481 | // optimizations. |
| 2482 | // The calls that need special treatment are the |
| 2483 | // direct (i.e. not aliased) eval calls. These calls are all of the |
| 2484 | // form eval(...) with no explicit receiver object where eval is not |
| 2485 | // declared in the current scope chain. These calls are marked as |
| 2486 | // potentially direct eval calls. Whether they are actually direct calls |
| 2487 | // to eval is determined at run time. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2488 | VariableProxy* callee = result->AsVariableProxy(); |
| 2489 | if (callee != NULL && callee->IsVariable(Factory::eval_symbol())) { |
| 2490 | Handle<String> name = callee->name(); |
| 2491 | Variable* var = top_scope_->Lookup(name); |
| 2492 | if (var == NULL) { |
| 2493 | top_scope_->RecordEvalCall(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2494 | } |
| 2495 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2496 | result = NewCall(result, args, pos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2497 | break; |
| 2498 | } |
| 2499 | |
| 2500 | case Token::PERIOD: { |
| 2501 | Consume(Token::PERIOD); |
| 2502 | int pos = scanner().location().beg_pos; |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2503 | Handle<String> name = ParseIdentifierName(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2504 | result = new Property(result, new Literal(name), pos); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2505 | if (fni_ != NULL) fni_->PushLiteralName(name); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2506 | break; |
| 2507 | } |
| 2508 | |
| 2509 | default: |
| 2510 | return result; |
| 2511 | } |
| 2512 | } |
| 2513 | } |
| 2514 | |
| 2515 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2516 | Expression* Parser::ParseNewPrefix(PositionStack* stack, bool* ok) { |
| 2517 | // NewExpression :: |
| 2518 | // ('new')+ MemberExpression |
| 2519 | |
| 2520 | // The grammar for new expressions is pretty warped. The keyword |
| 2521 | // 'new' can either be a part of the new expression (where it isn't |
| 2522 | // followed by an argument list) or a part of the member expression, |
| 2523 | // where it must be followed by an argument list. To accommodate |
| 2524 | // this, we parse the 'new' keywords greedily and keep track of how |
| 2525 | // many we have parsed. This information is then passed on to the |
| 2526 | // member expression parser, which is only allowed to match argument |
| 2527 | // lists as long as it has 'new' prefixes left |
| 2528 | Expect(Token::NEW, CHECK_OK); |
| 2529 | PositionStack::Element pos(stack, scanner().location().beg_pos); |
| 2530 | |
| 2531 | Expression* result; |
| 2532 | if (peek() == Token::NEW) { |
| 2533 | result = ParseNewPrefix(stack, CHECK_OK); |
| 2534 | } else { |
| 2535 | result = ParseMemberWithNewPrefixesExpression(stack, CHECK_OK); |
| 2536 | } |
| 2537 | |
| 2538 | if (!stack->is_empty()) { |
| 2539 | int last = stack->pop(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2540 | result = new CallNew(result, new ZoneList<Expression*>(0), last); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2541 | } |
| 2542 | return result; |
| 2543 | } |
| 2544 | |
| 2545 | |
| 2546 | Expression* Parser::ParseNewExpression(bool* ok) { |
| 2547 | PositionStack stack(ok); |
| 2548 | return ParseNewPrefix(&stack, ok); |
| 2549 | } |
| 2550 | |
| 2551 | |
| 2552 | Expression* Parser::ParseMemberExpression(bool* ok) { |
| 2553 | return ParseMemberWithNewPrefixesExpression(NULL, ok); |
| 2554 | } |
| 2555 | |
| 2556 | |
| 2557 | Expression* Parser::ParseMemberWithNewPrefixesExpression(PositionStack* stack, |
| 2558 | bool* ok) { |
| 2559 | // MemberExpression :: |
| 2560 | // (PrimaryExpression | FunctionLiteral) |
| 2561 | // ('[' Expression ']' | '.' Identifier | Arguments)* |
| 2562 | |
| 2563 | // Parse the initial primary or function expression. |
| 2564 | Expression* result = NULL; |
| 2565 | if (peek() == Token::FUNCTION) { |
| 2566 | Expect(Token::FUNCTION, CHECK_OK); |
| 2567 | int function_token_position = scanner().location().beg_pos; |
| 2568 | Handle<String> name; |
| 2569 | if (peek() == Token::IDENTIFIER) name = ParseIdentifier(CHECK_OK); |
| 2570 | result = ParseFunctionLiteral(name, function_token_position, |
| 2571 | NESTED, CHECK_OK); |
| 2572 | } else { |
| 2573 | result = ParsePrimaryExpression(CHECK_OK); |
| 2574 | } |
| 2575 | |
| 2576 | while (true) { |
| 2577 | switch (peek()) { |
| 2578 | case Token::LBRACK: { |
| 2579 | Consume(Token::LBRACK); |
| 2580 | int pos = scanner().location().beg_pos; |
| 2581 | Expression* index = ParseExpression(true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2582 | result = new Property(result, index, pos); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2583 | Expect(Token::RBRACK, CHECK_OK); |
| 2584 | break; |
| 2585 | } |
| 2586 | case Token::PERIOD: { |
| 2587 | Consume(Token::PERIOD); |
| 2588 | int pos = scanner().location().beg_pos; |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2589 | Handle<String> name = ParseIdentifierName(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2590 | result = new Property(result, new Literal(name), pos); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2591 | if (fni_ != NULL) fni_->PushLiteralName(name); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2592 | break; |
| 2593 | } |
| 2594 | case Token::LPAREN: { |
| 2595 | if ((stack == NULL) || stack->is_empty()) return result; |
| 2596 | // Consume one of the new prefixes (already parsed). |
| 2597 | ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
| 2598 | int last = stack->pop(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2599 | result = new CallNew(result, args, last); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2600 | break; |
| 2601 | } |
| 2602 | default: |
| 2603 | return result; |
| 2604 | } |
| 2605 | } |
| 2606 | } |
| 2607 | |
| 2608 | |
| 2609 | DebuggerStatement* Parser::ParseDebuggerStatement(bool* ok) { |
| 2610 | // In ECMA-262 'debugger' is defined as a reserved keyword. In some browser |
| 2611 | // contexts this is used as a statement which invokes the debugger as i a |
| 2612 | // break point is present. |
| 2613 | // DebuggerStatement :: |
| 2614 | // 'debugger' ';' |
| 2615 | |
| 2616 | Expect(Token::DEBUGGER, CHECK_OK); |
| 2617 | ExpectSemicolon(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2618 | return new DebuggerStatement(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2619 | } |
| 2620 | |
| 2621 | |
| 2622 | void Parser::ReportUnexpectedToken(Token::Value token) { |
| 2623 | // We don't report stack overflows here, to avoid increasing the |
| 2624 | // stack depth even further. Instead we report it after parsing is |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2625 | // over, in ParseProgram/ParseJson. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2626 | if (token == Token::ILLEGAL && stack_overflow_) return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2627 | // Four of the tokens are treated specially |
| 2628 | switch (token) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2629 | case Token::EOS: |
| 2630 | return ReportMessage("unexpected_eos", Vector<const char*>::empty()); |
| 2631 | case Token::NUMBER: |
| 2632 | return ReportMessage("unexpected_token_number", |
| 2633 | Vector<const char*>::empty()); |
| 2634 | case Token::STRING: |
| 2635 | return ReportMessage("unexpected_token_string", |
| 2636 | Vector<const char*>::empty()); |
| 2637 | case Token::IDENTIFIER: |
| 2638 | return ReportMessage("unexpected_token_identifier", |
| 2639 | Vector<const char*>::empty()); |
| 2640 | default: |
| 2641 | const char* name = Token::String(token); |
| 2642 | ASSERT(name != NULL); |
| 2643 | ReportMessage("unexpected_token", Vector<const char*>(&name, 1)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2644 | } |
| 2645 | } |
| 2646 | |
| 2647 | |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 2648 | void Parser::ReportInvalidPreparseData(Handle<String> name, bool* ok) { |
| 2649 | SmartPointer<char> name_string = name->ToCString(DISALLOW_NULLS); |
| 2650 | const char* element[1] = { *name_string }; |
| 2651 | ReportMessage("invalid_preparser_data", |
| 2652 | Vector<const char*>(element, 1)); |
| 2653 | *ok = false; |
| 2654 | } |
| 2655 | |
| 2656 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2657 | Expression* Parser::ParsePrimaryExpression(bool* ok) { |
| 2658 | // PrimaryExpression :: |
| 2659 | // 'this' |
| 2660 | // 'null' |
| 2661 | // 'true' |
| 2662 | // 'false' |
| 2663 | // Identifier |
| 2664 | // Number |
| 2665 | // String |
| 2666 | // ArrayLiteral |
| 2667 | // ObjectLiteral |
| 2668 | // RegExpLiteral |
| 2669 | // '(' Expression ')' |
| 2670 | |
| 2671 | Expression* result = NULL; |
| 2672 | switch (peek()) { |
| 2673 | case Token::THIS: { |
| 2674 | Consume(Token::THIS); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2675 | VariableProxy* recv = top_scope_->receiver(); |
| 2676 | result = recv; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2677 | break; |
| 2678 | } |
| 2679 | |
| 2680 | case Token::NULL_LITERAL: |
| 2681 | Consume(Token::NULL_LITERAL); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2682 | result = new Literal(Factory::null_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2683 | break; |
| 2684 | |
| 2685 | case Token::TRUE_LITERAL: |
| 2686 | Consume(Token::TRUE_LITERAL); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2687 | result = new Literal(Factory::true_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2688 | break; |
| 2689 | |
| 2690 | case Token::FALSE_LITERAL: |
| 2691 | Consume(Token::FALSE_LITERAL); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2692 | result = new Literal(Factory::false_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2693 | break; |
| 2694 | |
| 2695 | case Token::IDENTIFIER: { |
| 2696 | Handle<String> name = ParseIdentifier(CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2697 | if (fni_ != NULL) fni_->PushVariableName(name); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2698 | result = top_scope_->NewUnresolved(name, inside_with()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2699 | break; |
| 2700 | } |
| 2701 | |
| 2702 | case Token::NUMBER: { |
| 2703 | Consume(Token::NUMBER); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 2704 | ASSERT(scanner().is_literal_ascii()); |
| 2705 | double value = StringToDouble(scanner().literal_ascii_string(), |
| 2706 | ALLOW_HEX | ALLOW_OCTALS); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2707 | result = NewNumberLiteral(value); |
| 2708 | break; |
| 2709 | } |
| 2710 | |
| 2711 | case Token::STRING: { |
| 2712 | Consume(Token::STRING); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2713 | Handle<String> symbol = GetSymbol(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2714 | result = new Literal(symbol); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2715 | if (fni_ != NULL) fni_->PushLiteralName(symbol); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2716 | break; |
| 2717 | } |
| 2718 | |
| 2719 | case Token::ASSIGN_DIV: |
| 2720 | result = ParseRegExpLiteral(true, CHECK_OK); |
| 2721 | break; |
| 2722 | |
| 2723 | case Token::DIV: |
| 2724 | result = ParseRegExpLiteral(false, CHECK_OK); |
| 2725 | break; |
| 2726 | |
| 2727 | case Token::LBRACK: |
| 2728 | result = ParseArrayLiteral(CHECK_OK); |
| 2729 | break; |
| 2730 | |
| 2731 | case Token::LBRACE: |
| 2732 | result = ParseObjectLiteral(CHECK_OK); |
| 2733 | break; |
| 2734 | |
| 2735 | case Token::LPAREN: |
| 2736 | Consume(Token::LPAREN); |
| 2737 | result = ParseExpression(true, CHECK_OK); |
| 2738 | Expect(Token::RPAREN, CHECK_OK); |
| 2739 | break; |
| 2740 | |
| 2741 | case Token::MOD: |
| 2742 | if (allow_natives_syntax_ || extension_ != NULL) { |
| 2743 | result = ParseV8Intrinsic(CHECK_OK); |
| 2744 | break; |
| 2745 | } |
| 2746 | // If we're not allowing special syntax we fall-through to the |
| 2747 | // default case. |
| 2748 | |
| 2749 | default: { |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2750 | Token::Value tok = Next(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2751 | ReportUnexpectedToken(tok); |
| 2752 | *ok = false; |
| 2753 | return NULL; |
| 2754 | } |
| 2755 | } |
| 2756 | |
| 2757 | return result; |
| 2758 | } |
| 2759 | |
| 2760 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2761 | void Parser::BuildArrayLiteralBoilerplateLiterals(ZoneList<Expression*>* values, |
| 2762 | Handle<FixedArray> literals, |
| 2763 | bool* is_simple, |
| 2764 | int* depth) { |
| 2765 | // Fill in the literals. |
| 2766 | // Accumulate output values in local variables. |
| 2767 | bool is_simple_acc = true; |
| 2768 | int depth_acc = 1; |
| 2769 | for (int i = 0; i < values->length(); i++) { |
| 2770 | MaterializedLiteral* m_literal = values->at(i)->AsMaterializedLiteral(); |
| 2771 | if (m_literal != NULL && m_literal->depth() >= depth_acc) { |
| 2772 | depth_acc = m_literal->depth() + 1; |
| 2773 | } |
| 2774 | Handle<Object> boilerplate_value = GetBoilerplateValue(values->at(i)); |
| 2775 | if (boilerplate_value->IsUndefined()) { |
| 2776 | literals->set_the_hole(i); |
| 2777 | is_simple_acc = false; |
| 2778 | } else { |
| 2779 | literals->set(i, *boilerplate_value); |
| 2780 | } |
| 2781 | } |
| 2782 | |
| 2783 | *is_simple = is_simple_acc; |
| 2784 | *depth = depth_acc; |
| 2785 | } |
| 2786 | |
| 2787 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2788 | Expression* Parser::ParseArrayLiteral(bool* ok) { |
| 2789 | // ArrayLiteral :: |
| 2790 | // '[' Expression? (',' Expression?)* ']' |
| 2791 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2792 | ZoneList<Expression*>* values = new ZoneList<Expression*>(4); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2793 | Expect(Token::LBRACK, CHECK_OK); |
| 2794 | while (peek() != Token::RBRACK) { |
| 2795 | Expression* elem; |
| 2796 | if (peek() == Token::COMMA) { |
| 2797 | elem = GetLiteralTheHole(); |
| 2798 | } else { |
| 2799 | elem = ParseAssignmentExpression(true, CHECK_OK); |
| 2800 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2801 | values->Add(elem); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2802 | if (peek() != Token::RBRACK) { |
| 2803 | Expect(Token::COMMA, CHECK_OK); |
| 2804 | } |
| 2805 | } |
| 2806 | Expect(Token::RBRACK, CHECK_OK); |
| 2807 | |
| 2808 | // Update the scope information before the pre-parsing bailout. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2809 | int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
| 2810 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2811 | // Allocate a fixed array with all the literals. |
| 2812 | Handle<FixedArray> literals = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2813 | Factory::NewFixedArray(values->length(), TENURED); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2814 | |
| 2815 | // Fill in the literals. |
| 2816 | bool is_simple = true; |
| 2817 | int depth = 1; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2818 | for (int i = 0, n = values->length(); i < n; i++) { |
| 2819 | MaterializedLiteral* m_literal = values->at(i)->AsMaterializedLiteral(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2820 | if (m_literal != NULL && m_literal->depth() + 1 > depth) { |
| 2821 | depth = m_literal->depth() + 1; |
| 2822 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2823 | Handle<Object> boilerplate_value = GetBoilerplateValue(values->at(i)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2824 | if (boilerplate_value->IsUndefined()) { |
| 2825 | literals->set_the_hole(i); |
| 2826 | is_simple = false; |
| 2827 | } else { |
| 2828 | literals->set(i, *boilerplate_value); |
| 2829 | } |
| 2830 | } |
| 2831 | |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2832 | // Simple and shallow arrays can be lazily copied, we transform the |
| 2833 | // elements array to a copy-on-write array. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2834 | if (is_simple && depth == 1 && values->length() > 0) { |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2835 | literals->set_map(Heap::fixed_cow_array_map()); |
| 2836 | } |
| 2837 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2838 | return new ArrayLiteral(literals, values, |
| 2839 | literal_index, is_simple, depth); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2840 | } |
| 2841 | |
| 2842 | |
| 2843 | bool Parser::IsBoilerplateProperty(ObjectLiteral::Property* property) { |
| 2844 | return property != NULL && |
| 2845 | property->kind() != ObjectLiteral::Property::PROTOTYPE; |
| 2846 | } |
| 2847 | |
| 2848 | |
| 2849 | bool CompileTimeValue::IsCompileTimeValue(Expression* expression) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2850 | if (expression->AsLiteral() != NULL) return true; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2851 | MaterializedLiteral* lit = expression->AsMaterializedLiteral(); |
| 2852 | return lit != NULL && lit->is_simple(); |
| 2853 | } |
| 2854 | |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2855 | |
| 2856 | bool CompileTimeValue::ArrayLiteralElementNeedsInitialization( |
| 2857 | Expression* value) { |
| 2858 | // If value is a literal the property value is already set in the |
| 2859 | // boilerplate object. |
| 2860 | if (value->AsLiteral() != NULL) return false; |
| 2861 | // If value is a materialized literal the property value is already set |
| 2862 | // in the boilerplate object if it is simple. |
| 2863 | if (CompileTimeValue::IsCompileTimeValue(value)) return false; |
| 2864 | return true; |
| 2865 | } |
| 2866 | |
| 2867 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2868 | Handle<FixedArray> CompileTimeValue::GetValue(Expression* expression) { |
| 2869 | ASSERT(IsCompileTimeValue(expression)); |
| 2870 | Handle<FixedArray> result = Factory::NewFixedArray(2, TENURED); |
| 2871 | ObjectLiteral* object_literal = expression->AsObjectLiteral(); |
| 2872 | if (object_literal != NULL) { |
| 2873 | ASSERT(object_literal->is_simple()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2874 | if (object_literal->fast_elements()) { |
| 2875 | result->set(kTypeSlot, Smi::FromInt(OBJECT_LITERAL_FAST_ELEMENTS)); |
| 2876 | } else { |
| 2877 | result->set(kTypeSlot, Smi::FromInt(OBJECT_LITERAL_SLOW_ELEMENTS)); |
| 2878 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2879 | result->set(kElementsSlot, *object_literal->constant_properties()); |
| 2880 | } else { |
| 2881 | ArrayLiteral* array_literal = expression->AsArrayLiteral(); |
| 2882 | ASSERT(array_literal != NULL && array_literal->is_simple()); |
| 2883 | result->set(kTypeSlot, Smi::FromInt(ARRAY_LITERAL)); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 2884 | result->set(kElementsSlot, *array_literal->constant_elements()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2885 | } |
| 2886 | return result; |
| 2887 | } |
| 2888 | |
| 2889 | |
| 2890 | CompileTimeValue::Type CompileTimeValue::GetType(Handle<FixedArray> value) { |
| 2891 | Smi* type_value = Smi::cast(value->get(kTypeSlot)); |
| 2892 | return static_cast<Type>(type_value->value()); |
| 2893 | } |
| 2894 | |
| 2895 | |
| 2896 | Handle<FixedArray> CompileTimeValue::GetElements(Handle<FixedArray> value) { |
| 2897 | return Handle<FixedArray>(FixedArray::cast(value->get(kElementsSlot))); |
| 2898 | } |
| 2899 | |
| 2900 | |
| 2901 | Handle<Object> Parser::GetBoilerplateValue(Expression* expression) { |
| 2902 | if (expression->AsLiteral() != NULL) { |
| 2903 | return expression->AsLiteral()->handle(); |
| 2904 | } |
| 2905 | if (CompileTimeValue::IsCompileTimeValue(expression)) { |
| 2906 | return CompileTimeValue::GetValue(expression); |
| 2907 | } |
| 2908 | return Factory::undefined_value(); |
| 2909 | } |
| 2910 | |
| 2911 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2912 | void Parser::BuildObjectLiteralConstantProperties( |
| 2913 | ZoneList<ObjectLiteral::Property*>* properties, |
| 2914 | Handle<FixedArray> constant_properties, |
| 2915 | bool* is_simple, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2916 | bool* fast_elements, |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2917 | int* depth) { |
| 2918 | int position = 0; |
| 2919 | // Accumulate the value in local variables and store it at the end. |
| 2920 | bool is_simple_acc = true; |
| 2921 | int depth_acc = 1; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2922 | uint32_t max_element_index = 0; |
| 2923 | uint32_t elements = 0; |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2924 | for (int i = 0; i < properties->length(); i++) { |
| 2925 | ObjectLiteral::Property* property = properties->at(i); |
| 2926 | if (!IsBoilerplateProperty(property)) { |
| 2927 | is_simple_acc = false; |
| 2928 | continue; |
| 2929 | } |
| 2930 | MaterializedLiteral* m_literal = property->value()->AsMaterializedLiteral(); |
| 2931 | if (m_literal != NULL && m_literal->depth() >= depth_acc) { |
| 2932 | depth_acc = m_literal->depth() + 1; |
| 2933 | } |
| 2934 | |
| 2935 | // Add CONSTANT and COMPUTED properties to boilerplate. Use undefined |
| 2936 | // value for COMPUTED properties, the real value is filled in at |
| 2937 | // runtime. The enumeration order is maintained. |
| 2938 | Handle<Object> key = property->key()->handle(); |
| 2939 | Handle<Object> value = GetBoilerplateValue(property->value()); |
| 2940 | is_simple_acc = is_simple_acc && !value->IsUndefined(); |
| 2941 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2942 | // Keep track of the number of elements in the object literal and |
| 2943 | // the largest element index. If the largest element index is |
| 2944 | // much larger than the number of elements, creating an object |
| 2945 | // literal with fast elements will be a waste of space. |
| 2946 | uint32_t element_index = 0; |
| 2947 | if (key->IsString() |
| 2948 | && Handle<String>::cast(key)->AsArrayIndex(&element_index) |
| 2949 | && element_index > max_element_index) { |
| 2950 | max_element_index = element_index; |
| 2951 | elements++; |
| 2952 | } else if (key->IsSmi()) { |
| 2953 | int key_value = Smi::cast(*key)->value(); |
| 2954 | if (key_value > 0 |
| 2955 | && static_cast<uint32_t>(key_value) > max_element_index) { |
| 2956 | max_element_index = key_value; |
| 2957 | } |
| 2958 | elements++; |
| 2959 | } |
| 2960 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2961 | // Add name, value pair to the fixed array. |
| 2962 | constant_properties->set(position++, *key); |
| 2963 | constant_properties->set(position++, *value); |
| 2964 | } |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2965 | *fast_elements = |
| 2966 | (max_element_index <= 32) || ((2 * elements) >= max_element_index); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2967 | *is_simple = is_simple_acc; |
| 2968 | *depth = depth_acc; |
| 2969 | } |
| 2970 | |
| 2971 | |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2972 | ObjectLiteral::Property* Parser::ParseObjectLiteralGetSet(bool is_getter, |
| 2973 | bool* ok) { |
| 2974 | // Special handling of getter and setter syntax: |
| 2975 | // { ... , get foo() { ... }, ... , set foo(v) { ... v ... } , ... } |
| 2976 | // We have already read the "get" or "set" keyword. |
| 2977 | Token::Value next = Next(); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 2978 | bool is_keyword = Token::IsKeyword(next); |
| 2979 | if (next == Token::IDENTIFIER || next == Token::NUMBER || |
| 2980 | next == Token::STRING || is_keyword) { |
| 2981 | Handle<String> name; |
| 2982 | if (is_keyword) { |
| 2983 | name = Factory::LookupAsciiSymbol(Token::String(next)); |
| 2984 | } else { |
| 2985 | name = GetSymbol(CHECK_OK); |
| 2986 | } |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2987 | FunctionLiteral* value = |
| 2988 | ParseFunctionLiteral(name, |
| 2989 | RelocInfo::kNoPosition, |
| 2990 | DECLARATION, |
| 2991 | CHECK_OK); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 2992 | // Allow any number of parameters for compatiabilty with JSC. |
| 2993 | // Specification only allows zero parameters for get and one for set. |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2994 | ObjectLiteral::Property* property = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 2995 | new ObjectLiteral::Property(is_getter, value); |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 2996 | return property; |
| 2997 | } else { |
| 2998 | ReportUnexpectedToken(next); |
| 2999 | *ok = false; |
| 3000 | return NULL; |
| 3001 | } |
| 3002 | } |
| 3003 | |
| 3004 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3005 | Expression* Parser::ParseObjectLiteral(bool* ok) { |
| 3006 | // ObjectLiteral :: |
| 3007 | // '{' ( |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3008 | // ((IdentifierName | String | Number) ':' AssignmentExpression) |
| 3009 | // | (('get' | 'set') (IdentifierName | String | Number) FunctionLiteral) |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3010 | // )*[','] '}' |
| 3011 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3012 | ZoneList<ObjectLiteral::Property*>* properties = |
| 3013 | new ZoneList<ObjectLiteral::Property*>(4); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3014 | int number_of_boilerplate_properties = 0; |
| 3015 | |
| 3016 | Expect(Token::LBRACE, CHECK_OK); |
| 3017 | while (peek() != Token::RBRACE) { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3018 | if (fni_ != NULL) fni_->Enter(); |
| 3019 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3020 | Literal* key = NULL; |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3021 | Token::Value next = peek(); |
| 3022 | switch (next) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3023 | case Token::IDENTIFIER: { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3024 | bool is_getter = false; |
| 3025 | bool is_setter = false; |
| 3026 | Handle<String> id = |
| 3027 | ParseIdentifierOrGetOrSet(&is_getter, &is_setter, CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3028 | if (fni_ != NULL) fni_->PushLiteralName(id); |
| 3029 | |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3030 | if ((is_getter || is_setter) && peek() != Token::COLON) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3031 | ObjectLiteral::Property* property = |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3032 | ParseObjectLiteralGetSet(is_getter, CHECK_OK); |
| 3033 | if (IsBoilerplateProperty(property)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3034 | number_of_boilerplate_properties++; |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3035 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3036 | properties->Add(property); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3037 | if (peek() != Token::RBRACE) Expect(Token::COMMA, CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3038 | |
| 3039 | if (fni_ != NULL) { |
| 3040 | fni_->Infer(); |
| 3041 | fni_->Leave(); |
| 3042 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3043 | continue; // restart the while |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3044 | } |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3045 | // Failed to parse as get/set property, so it's just a property |
| 3046 | // called "get" or "set". |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3047 | key = new Literal(id); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3048 | break; |
| 3049 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3050 | case Token::STRING: { |
| 3051 | Consume(Token::STRING); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 3052 | Handle<String> string = GetSymbol(CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3053 | if (fni_ != NULL) fni_->PushLiteralName(string); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3054 | uint32_t index; |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 3055 | if (!string.is_null() && string->AsArrayIndex(&index)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3056 | key = NewNumberLiteral(index); |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3057 | break; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3058 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3059 | key = new Literal(string); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3060 | break; |
| 3061 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3062 | case Token::NUMBER: { |
| 3063 | Consume(Token::NUMBER); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3064 | ASSERT(scanner().is_literal_ascii()); |
| 3065 | double value = StringToDouble(scanner().literal_ascii_string(), |
| 3066 | ALLOW_HEX | ALLOW_OCTALS); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3067 | key = NewNumberLiteral(value); |
| 3068 | break; |
| 3069 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3070 | default: |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3071 | if (Token::IsKeyword(next)) { |
| 3072 | Consume(next); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 3073 | Handle<String> string = GetSymbol(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3074 | key = new Literal(string); |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3075 | } else { |
| 3076 | // Unexpected token. |
| 3077 | Token::Value next = Next(); |
| 3078 | ReportUnexpectedToken(next); |
| 3079 | *ok = false; |
| 3080 | return NULL; |
| 3081 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3082 | } |
| 3083 | |
| 3084 | Expect(Token::COLON, CHECK_OK); |
| 3085 | Expression* value = ParseAssignmentExpression(true, CHECK_OK); |
| 3086 | |
| 3087 | ObjectLiteral::Property* property = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3088 | new ObjectLiteral::Property(key, value); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3089 | |
| 3090 | // Count CONSTANT or COMPUTED properties to maintain the enumeration order. |
| 3091 | if (IsBoilerplateProperty(property)) number_of_boilerplate_properties++; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3092 | properties->Add(property); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3093 | |
| 3094 | // TODO(1240767): Consider allowing trailing comma. |
| 3095 | if (peek() != Token::RBRACE) Expect(Token::COMMA, CHECK_OK); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3096 | |
| 3097 | if (fni_ != NULL) { |
| 3098 | fni_->Infer(); |
| 3099 | fni_->Leave(); |
| 3100 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3101 | } |
| 3102 | Expect(Token::RBRACE, CHECK_OK); |
| 3103 | // Computation of literal_index must happen before pre parse bailout. |
| 3104 | int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3105 | |
| 3106 | Handle<FixedArray> constant_properties = |
| 3107 | Factory::NewFixedArray(number_of_boilerplate_properties * 2, TENURED); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3108 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3109 | bool is_simple = true; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3110 | bool fast_elements = true; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3111 | int depth = 1; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3112 | BuildObjectLiteralConstantProperties(properties, |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3113 | constant_properties, |
| 3114 | &is_simple, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3115 | &fast_elements, |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3116 | &depth); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3117 | return new ObjectLiteral(constant_properties, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3118 | properties, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3119 | literal_index, |
| 3120 | is_simple, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3121 | fast_elements, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3122 | depth); |
| 3123 | } |
| 3124 | |
| 3125 | |
| 3126 | Expression* Parser::ParseRegExpLiteral(bool seen_equal, bool* ok) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3127 | if (!scanner().ScanRegExpPattern(seen_equal)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3128 | Next(); |
| 3129 | ReportMessage("unterminated_regexp", Vector<const char*>::empty()); |
| 3130 | *ok = false; |
| 3131 | return NULL; |
| 3132 | } |
| 3133 | |
| 3134 | int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
| 3135 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3136 | Handle<String> js_pattern = NextLiteralString(TENURED); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3137 | scanner().ScanRegExpFlags(); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3138 | Handle<String> js_flags = NextLiteralString(TENURED); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3139 | Next(); |
| 3140 | |
| 3141 | return new RegExpLiteral(js_pattern, js_flags, literal_index); |
| 3142 | } |
| 3143 | |
| 3144 | |
| 3145 | ZoneList<Expression*>* Parser::ParseArguments(bool* ok) { |
| 3146 | // Arguments :: |
| 3147 | // '(' (AssignmentExpression)*[','] ')' |
| 3148 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3149 | ZoneList<Expression*>* result = new ZoneList<Expression*>(4); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3150 | Expect(Token::LPAREN, CHECK_OK); |
| 3151 | bool done = (peek() == Token::RPAREN); |
| 3152 | while (!done) { |
| 3153 | Expression* argument = ParseAssignmentExpression(true, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3154 | result->Add(argument); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3155 | done = (peek() == Token::RPAREN); |
| 3156 | if (!done) Expect(Token::COMMA, CHECK_OK); |
| 3157 | } |
| 3158 | Expect(Token::RPAREN, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3159 | return result; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3160 | } |
| 3161 | |
| 3162 | |
| 3163 | FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name, |
| 3164 | int function_token_position, |
| 3165 | FunctionLiteralType type, |
| 3166 | bool* ok) { |
| 3167 | // Function :: |
| 3168 | // '(' FormalParameterList? ')' '{' FunctionBody '}' |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3169 | bool is_named = !var_name.is_null(); |
| 3170 | |
| 3171 | // The name associated with this function. If it's a function expression, |
| 3172 | // this is the actual function name, otherwise this is the name of the |
| 3173 | // variable declared and initialized with the function (expression). In |
| 3174 | // that case, we don't have a function name (it's empty). |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3175 | Handle<String> name = is_named ? var_name : Factory::empty_symbol(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3176 | // The function name, if any. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3177 | Handle<String> function_name = Factory::empty_symbol(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3178 | if (is_named && (type == EXPRESSION || type == NESTED)) { |
| 3179 | function_name = name; |
| 3180 | } |
| 3181 | |
| 3182 | int num_parameters = 0; |
| 3183 | // Parse function body. |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 3184 | { Scope* scope = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3185 | NewScope(top_scope_, Scope::FUNCTION_SCOPE, inside_with()); |
| 3186 | LexicalScope lexical_scope(&this->top_scope_, &this->with_nesting_level_, |
| 3187 | scope); |
| 3188 | TemporaryScope temp_scope(&this->temp_scope_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3189 | top_scope_->SetScopeName(name); |
| 3190 | |
| 3191 | // FormalParameterList :: |
| 3192 | // '(' (Identifier)*[','] ')' |
| 3193 | Expect(Token::LPAREN, CHECK_OK); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3194 | int start_pos = scanner().location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3195 | bool done = (peek() == Token::RPAREN); |
| 3196 | while (!done) { |
| 3197 | Handle<String> param_name = ParseIdentifier(CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3198 | top_scope_->AddParameter(top_scope_->DeclareLocal(param_name, |
| 3199 | Variable::VAR)); |
| 3200 | num_parameters++; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3201 | done = (peek() == Token::RPAREN); |
| 3202 | if (!done) Expect(Token::COMMA, CHECK_OK); |
| 3203 | } |
| 3204 | Expect(Token::RPAREN, CHECK_OK); |
| 3205 | |
| 3206 | Expect(Token::LBRACE, CHECK_OK); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3207 | ZoneList<Statement*>* body = new ZoneList<Statement*>(8); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3208 | |
| 3209 | // If we have a named function expression, we add a local variable |
| 3210 | // declaration to the body of the function with the name of the |
| 3211 | // function and let it refer to the function itself (closure). |
| 3212 | // NOTE: We create a proxy and resolve it here so that in the |
| 3213 | // future we can change the AST to only refer to VariableProxies |
| 3214 | // instead of Variables and Proxis as is the case now. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3215 | if (!function_name.is_null() && function_name->length() > 0) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3216 | Variable* fvar = top_scope_->DeclareFunctionVar(function_name); |
| 3217 | VariableProxy* fproxy = |
| 3218 | top_scope_->NewUnresolved(function_name, inside_with()); |
| 3219 | fproxy->BindTo(fvar); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3220 | body->Add(new ExpressionStatement( |
| 3221 | new Assignment(Token::INIT_CONST, fproxy, |
| 3222 | new ThisFunction(), |
| 3223 | RelocInfo::kNoPosition))); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3224 | } |
| 3225 | |
| 3226 | // Determine if the function will be lazily compiled. The mode can |
| 3227 | // only be PARSE_LAZILY if the --lazy flag is true. |
| 3228 | bool is_lazily_compiled = |
| 3229 | mode() == PARSE_LAZILY && top_scope_->HasTrivialOuterContext(); |
| 3230 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3231 | int function_block_pos = scanner().location().beg_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3232 | int materialized_literal_count; |
| 3233 | int expected_property_count; |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3234 | int end_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3235 | bool only_simple_this_property_assignments; |
| 3236 | Handle<FixedArray> this_property_assignments; |
| 3237 | if (is_lazily_compiled && pre_data() != NULL) { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3238 | FunctionEntry entry = pre_data()->GetFunctionEntry(function_block_pos); |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 3239 | if (!entry.is_valid()) { |
| 3240 | ReportInvalidPreparseData(name, CHECK_OK); |
| 3241 | } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3242 | end_pos = entry.end_pos(); |
| 3243 | if (end_pos <= function_block_pos) { |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 3244 | // End position greater than end of stream is safe, and hard to check. |
| 3245 | ReportInvalidPreparseData(name, CHECK_OK); |
| 3246 | } |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3247 | Counters::total_preparse_skipped.Increment(end_pos - function_block_pos); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3248 | // Seek to position just before terminal '}'. |
| 3249 | scanner().SeekForward(end_pos - 1); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3250 | materialized_literal_count = entry.literal_count(); |
| 3251 | expected_property_count = entry.property_count(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3252 | only_simple_this_property_assignments = false; |
| 3253 | this_property_assignments = Factory::empty_fixed_array(); |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3254 | Expect(Token::RBRACE, CHECK_OK); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3255 | } else { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3256 | ParseSourceElements(body, Token::RBRACE, CHECK_OK); |
| 3257 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3258 | materialized_literal_count = temp_scope.materialized_literal_count(); |
| 3259 | expected_property_count = temp_scope.expected_property_count(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3260 | only_simple_this_property_assignments = |
| 3261 | temp_scope.only_simple_this_property_assignments(); |
| 3262 | this_property_assignments = temp_scope.this_property_assignments(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3263 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3264 | Expect(Token::RBRACE, CHECK_OK); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3265 | end_pos = scanner().location().end_pos; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3266 | } |
| 3267 | |
| 3268 | FunctionLiteral* function_literal = |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3269 | new FunctionLiteral(name, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3270 | top_scope_, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3271 | body, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3272 | materialized_literal_count, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3273 | expected_property_count, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3274 | only_simple_this_property_assignments, |
| 3275 | this_property_assignments, |
| 3276 | num_parameters, |
| 3277 | start_pos, |
| 3278 | end_pos, |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3279 | function_name->length() > 0, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3280 | temp_scope.ContainsLoops()); |
| 3281 | function_literal->set_function_token_position(function_token_position); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3282 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3283 | if (fni_ != NULL && !is_named) fni_->AddFunction(function_literal); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3284 | return function_literal; |
| 3285 | } |
| 3286 | } |
| 3287 | |
| 3288 | |
| 3289 | Expression* Parser::ParseV8Intrinsic(bool* ok) { |
| 3290 | // CallRuntime :: |
| 3291 | // '%' Identifier Arguments |
| 3292 | |
| 3293 | Expect(Token::MOD, CHECK_OK); |
| 3294 | Handle<String> name = ParseIdentifier(CHECK_OK); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3295 | ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 3296 | |
| 3297 | if (extension_ != NULL) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3298 | // The extension structures are only accessible while parsing the |
| 3299 | // very first time not when reparsing because of lazy compilation. |
| 3300 | top_scope_->ForceEagerCompilation(); |
| 3301 | } |
| 3302 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 3303 | Runtime::Function* function = Runtime::FunctionForSymbol(name); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3304 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 3305 | // Check for built-in IS_VAR macro. |
| 3306 | if (function != NULL && |
| 3307 | function->intrinsic_type == Runtime::RUNTIME && |
| 3308 | function->function_id == Runtime::kIS_VAR) { |
| 3309 | // %IS_VAR(x) evaluates to x if x is a variable, |
| 3310 | // leads to a parse error otherwise. Could be implemented as an |
| 3311 | // inline function %_IS_VAR(x) to eliminate this special case. |
| 3312 | if (args->length() == 1 && args->at(0)->AsVariableProxy() != NULL) { |
| 3313 | return args->at(0); |
| 3314 | } else { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3315 | ReportMessage("unable_to_parse", Vector<const char*>::empty()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3316 | *ok = false; |
| 3317 | return NULL; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3318 | } |
| 3319 | } |
| 3320 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 3321 | // Check that the expected number of arguments are being passed. |
| 3322 | if (function != NULL && |
| 3323 | function->nargs != -1 && |
| 3324 | function->nargs != args->length()) { |
| 3325 | ReportMessage("illegal_access", Vector<const char*>::empty()); |
| 3326 | *ok = false; |
| 3327 | return NULL; |
| 3328 | } |
| 3329 | |
| 3330 | // We have a valid intrinsics call or a call to a builtin. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3331 | return new CallRuntime(name, function, args); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3332 | } |
| 3333 | |
| 3334 | |
| 3335 | void Parser::Consume(Token::Value token) { |
| 3336 | Token::Value next = Next(); |
| 3337 | USE(next); |
| 3338 | USE(token); |
| 3339 | ASSERT(next == token); |
| 3340 | } |
| 3341 | |
| 3342 | |
| 3343 | void Parser::Expect(Token::Value token, bool* ok) { |
| 3344 | Token::Value next = Next(); |
| 3345 | if (next == token) return; |
| 3346 | ReportUnexpectedToken(next); |
| 3347 | *ok = false; |
| 3348 | } |
| 3349 | |
| 3350 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3351 | bool Parser::Check(Token::Value token) { |
| 3352 | Token::Value next = peek(); |
| 3353 | if (next == token) { |
| 3354 | Consume(next); |
| 3355 | return true; |
| 3356 | } |
| 3357 | return false; |
| 3358 | } |
| 3359 | |
| 3360 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3361 | void Parser::ExpectSemicolon(bool* ok) { |
| 3362 | // Check for automatic semicolon insertion according to |
| 3363 | // the rules given in ECMA-262, section 7.9, page 21. |
| 3364 | Token::Value tok = peek(); |
| 3365 | if (tok == Token::SEMICOLON) { |
| 3366 | Next(); |
| 3367 | return; |
| 3368 | } |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3369 | if (scanner().has_line_terminator_before_next() || |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3370 | tok == Token::RBRACE || |
| 3371 | tok == Token::EOS) { |
| 3372 | return; |
| 3373 | } |
| 3374 | Expect(Token::SEMICOLON, ok); |
| 3375 | } |
| 3376 | |
| 3377 | |
| 3378 | Literal* Parser::GetLiteralUndefined() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3379 | return new Literal(Factory::undefined_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3380 | } |
| 3381 | |
| 3382 | |
| 3383 | Literal* Parser::GetLiteralTheHole() { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3384 | return new Literal(Factory::the_hole_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3385 | } |
| 3386 | |
| 3387 | |
| 3388 | Literal* Parser::GetLiteralNumber(double value) { |
| 3389 | return NewNumberLiteral(value); |
| 3390 | } |
| 3391 | |
| 3392 | |
| 3393 | Handle<String> Parser::ParseIdentifier(bool* ok) { |
| 3394 | Expect(Token::IDENTIFIER, ok); |
| 3395 | if (!*ok) return Handle<String>(); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 3396 | return GetSymbol(ok); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3397 | } |
| 3398 | |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3399 | |
| 3400 | Handle<String> Parser::ParseIdentifierName(bool* ok) { |
| 3401 | Token::Value next = Next(); |
| 3402 | if (next != Token::IDENTIFIER && !Token::IsKeyword(next)) { |
| 3403 | ReportUnexpectedToken(next); |
| 3404 | *ok = false; |
| 3405 | return Handle<String>(); |
| 3406 | } |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 3407 | return GetSymbol(ok); |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3408 | } |
| 3409 | |
| 3410 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3411 | // This function reads an identifier and determines whether or not it |
| 3412 | // is 'get' or 'set'. The reason for not using ParseIdentifier and |
| 3413 | // checking on the output is that this involves heap allocation which |
| 3414 | // we can't do during preparsing. |
| 3415 | Handle<String> Parser::ParseIdentifierOrGetOrSet(bool* is_get, |
| 3416 | bool* is_set, |
| 3417 | bool* ok) { |
| 3418 | Expect(Token::IDENTIFIER, ok); |
| 3419 | if (!*ok) return Handle<String>(); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3420 | if (scanner().is_literal_ascii() && scanner().literal_length() == 3) { |
| 3421 | const char* token = scanner().literal_ascii_string().start(); |
| 3422 | *is_get = strncmp(token, "get", 3) == 0; |
| 3423 | *is_set = !*is_get && strncmp(token, "set", 3) == 0; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3424 | } |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 3425 | return GetSymbol(ok); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3426 | } |
| 3427 | |
| 3428 | |
| 3429 | // ---------------------------------------------------------------------------- |
| 3430 | // Parser support |
| 3431 | |
| 3432 | |
| 3433 | bool Parser::TargetStackContainsLabel(Handle<String> label) { |
| 3434 | for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| 3435 | BreakableStatement* stat = t->node()->AsBreakableStatement(); |
| 3436 | if (stat != NULL && ContainsLabel(stat->labels(), label)) |
| 3437 | return true; |
| 3438 | } |
| 3439 | return false; |
| 3440 | } |
| 3441 | |
| 3442 | |
| 3443 | BreakableStatement* Parser::LookupBreakTarget(Handle<String> label, bool* ok) { |
| 3444 | bool anonymous = label.is_null(); |
| 3445 | for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| 3446 | BreakableStatement* stat = t->node()->AsBreakableStatement(); |
| 3447 | if (stat == NULL) continue; |
| 3448 | if ((anonymous && stat->is_target_for_anonymous()) || |
| 3449 | (!anonymous && ContainsLabel(stat->labels(), label))) { |
| 3450 | RegisterTargetUse(stat->break_target(), t->previous()); |
| 3451 | return stat; |
| 3452 | } |
| 3453 | } |
| 3454 | return NULL; |
| 3455 | } |
| 3456 | |
| 3457 | |
| 3458 | IterationStatement* Parser::LookupContinueTarget(Handle<String> label, |
| 3459 | bool* ok) { |
| 3460 | bool anonymous = label.is_null(); |
| 3461 | for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| 3462 | IterationStatement* stat = t->node()->AsIterationStatement(); |
| 3463 | if (stat == NULL) continue; |
| 3464 | |
| 3465 | ASSERT(stat->is_target_for_anonymous()); |
| 3466 | if (anonymous || ContainsLabel(stat->labels(), label)) { |
| 3467 | RegisterTargetUse(stat->continue_target(), t->previous()); |
| 3468 | return stat; |
| 3469 | } |
| 3470 | } |
| 3471 | return NULL; |
| 3472 | } |
| 3473 | |
| 3474 | |
| 3475 | void Parser::RegisterTargetUse(BreakTarget* target, Target* stop) { |
| 3476 | // Register that a break target found at the given stop in the |
| 3477 | // target stack has been used from the top of the target stack. Add |
| 3478 | // the break target to any TargetCollectors passed on the stack. |
| 3479 | for (Target* t = target_stack_; t != stop; t = t->previous()) { |
| 3480 | TargetCollector* collector = t->node()->AsTargetCollector(); |
| 3481 | if (collector != NULL) collector->AddTarget(target); |
| 3482 | } |
| 3483 | } |
| 3484 | |
| 3485 | |
| 3486 | Literal* Parser::NewNumberLiteral(double number) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3487 | return new Literal(Factory::NewNumber(number, TENURED)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3488 | } |
| 3489 | |
| 3490 | |
| 3491 | Expression* Parser::NewThrowReferenceError(Handle<String> type) { |
| 3492 | return NewThrowError(Factory::MakeReferenceError_symbol(), |
| 3493 | type, HandleVector<Object>(NULL, 0)); |
| 3494 | } |
| 3495 | |
| 3496 | |
| 3497 | Expression* Parser::NewThrowSyntaxError(Handle<String> type, |
| 3498 | Handle<Object> first) { |
| 3499 | int argc = first.is_null() ? 0 : 1; |
| 3500 | Vector< Handle<Object> > arguments = HandleVector<Object>(&first, argc); |
| 3501 | return NewThrowError(Factory::MakeSyntaxError_symbol(), type, arguments); |
| 3502 | } |
| 3503 | |
| 3504 | |
| 3505 | Expression* Parser::NewThrowTypeError(Handle<String> type, |
| 3506 | Handle<Object> first, |
| 3507 | Handle<Object> second) { |
| 3508 | ASSERT(!first.is_null() && !second.is_null()); |
| 3509 | Handle<Object> elements[] = { first, second }; |
| 3510 | Vector< Handle<Object> > arguments = |
| 3511 | HandleVector<Object>(elements, ARRAY_SIZE(elements)); |
| 3512 | return NewThrowError(Factory::MakeTypeError_symbol(), type, arguments); |
| 3513 | } |
| 3514 | |
| 3515 | |
| 3516 | Expression* Parser::NewThrowError(Handle<String> constructor, |
| 3517 | Handle<String> type, |
| 3518 | Vector< Handle<Object> > arguments) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3519 | int argc = arguments.length(); |
| 3520 | Handle<JSArray> array = Factory::NewJSArray(argc, TENURED); |
| 3521 | ASSERT(array->IsJSArray() && array->HasFastElements()); |
| 3522 | for (int i = 0; i < argc; i++) { |
| 3523 | Handle<Object> element = arguments[i]; |
| 3524 | if (!element.is_null()) { |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 3525 | // We know this doesn't cause a GC here because we allocated the JSArray |
| 3526 | // large enough. |
John Reck | 5913587 | 2010-11-02 12:39:01 -0700 | [diff] [blame] | 3527 | array->SetFastElement(i, *element)->ToObjectUnchecked(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3528 | } |
| 3529 | } |
| 3530 | ZoneList<Expression*>* args = new ZoneList<Expression*>(2); |
| 3531 | args->Add(new Literal(type)); |
| 3532 | args->Add(new Literal(array)); |
| 3533 | return new Throw(new CallRuntime(constructor, NULL, args), |
| 3534 | scanner().location().beg_pos); |
| 3535 | } |
| 3536 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3537 | // ---------------------------------------------------------------------------- |
| 3538 | // JSON |
| 3539 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3540 | Handle<Object> JsonParser::ParseJson(Handle<String> script, |
| 3541 | UC16CharacterStream* source) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 3542 | scanner_.Initialize(source); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3543 | stack_overflow_ = false; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3544 | Handle<Object> result = ParseJsonValue(); |
| 3545 | if (result.is_null() || scanner_.Next() != Token::EOS) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3546 | if (stack_overflow_) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3547 | // Scanner failed. |
| 3548 | Top::StackOverflow(); |
| 3549 | } else { |
| 3550 | // Parse failed. Scanner's current token is the unexpected token. |
| 3551 | Token::Value token = scanner_.current_token(); |
| 3552 | |
| 3553 | const char* message; |
| 3554 | const char* name_opt = NULL; |
| 3555 | |
| 3556 | switch (token) { |
| 3557 | case Token::EOS: |
| 3558 | message = "unexpected_eos"; |
| 3559 | break; |
| 3560 | case Token::NUMBER: |
| 3561 | message = "unexpected_token_number"; |
| 3562 | break; |
| 3563 | case Token::STRING: |
| 3564 | message = "unexpected_token_string"; |
| 3565 | break; |
| 3566 | case Token::IDENTIFIER: |
| 3567 | message = "unexpected_token_identifier"; |
| 3568 | break; |
| 3569 | default: |
| 3570 | message = "unexpected_token"; |
| 3571 | name_opt = Token::String(token); |
| 3572 | ASSERT(name_opt != NULL); |
| 3573 | break; |
| 3574 | } |
| 3575 | |
| 3576 | Scanner::Location source_location = scanner_.location(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3577 | MessageLocation location(Factory::NewScript(script), |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3578 | source_location.beg_pos, |
| 3579 | source_location.end_pos); |
| 3580 | int argc = (name_opt == NULL) ? 0 : 1; |
| 3581 | Handle<JSArray> array = Factory::NewJSArray(argc); |
| 3582 | if (name_opt != NULL) { |
| 3583 | SetElement(array, |
| 3584 | 0, |
| 3585 | Factory::NewStringFromUtf8(CStrVector(name_opt))); |
| 3586 | } |
| 3587 | Handle<Object> result = Factory::NewSyntaxError(message, array); |
| 3588 | Top::Throw(*result, &location); |
| 3589 | return Handle<Object>::null(); |
| 3590 | } |
| 3591 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3592 | return result; |
| 3593 | } |
| 3594 | |
| 3595 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3596 | Handle<String> JsonParser::GetString() { |
| 3597 | int literal_length = scanner_.literal_length(); |
| 3598 | if (literal_length == 0) { |
| 3599 | return Factory::empty_string(); |
| 3600 | } |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3601 | if (scanner_.is_literal_ascii()) { |
| 3602 | return Factory::NewStringFromAscii(scanner_.literal_ascii_string()); |
| 3603 | } else { |
| 3604 | return Factory::NewStringFromTwoByte(scanner_.literal_uc16_string()); |
| 3605 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3606 | } |
| 3607 | |
| 3608 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3609 | // Parse any JSON value. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3610 | Handle<Object> JsonParser::ParseJsonValue() { |
| 3611 | Token::Value token = scanner_.Next(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3612 | switch (token) { |
| 3613 | case Token::STRING: { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3614 | return GetString(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3615 | } |
| 3616 | case Token::NUMBER: { |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 3617 | ASSERT(scanner_.is_literal_ascii()); |
| 3618 | double value = StringToDouble(scanner_.literal_ascii_string(), |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3619 | NO_FLAGS, // Hex, octal or trailing junk. |
| 3620 | OS::nan_value()); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3621 | return Factory::NewNumber(value); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3622 | } |
| 3623 | case Token::FALSE_LITERAL: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3624 | return Factory::false_value(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3625 | case Token::TRUE_LITERAL: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3626 | return Factory::true_value(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3627 | case Token::NULL_LITERAL: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3628 | return Factory::null_value(); |
| 3629 | case Token::LBRACE: |
| 3630 | return ParseJsonObject(); |
| 3631 | case Token::LBRACK: |
| 3632 | return ParseJsonArray(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3633 | default: |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3634 | return ReportUnexpectedToken(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3635 | } |
| 3636 | } |
| 3637 | |
| 3638 | |
| 3639 | // Parse a JSON object. Scanner must be right after '{' token. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3640 | Handle<Object> JsonParser::ParseJsonObject() { |
| 3641 | Handle<JSFunction> object_constructor( |
| 3642 | Top::global_context()->object_function()); |
| 3643 | Handle<JSObject> json_object = Factory::NewJSObject(object_constructor); |
| 3644 | if (scanner_.peek() == Token::RBRACE) { |
| 3645 | scanner_.Next(); |
| 3646 | } else { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3647 | if (StackLimitCheck().HasOverflowed()) { |
| 3648 | stack_overflow_ = true; |
| 3649 | return Handle<Object>::null(); |
| 3650 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3651 | do { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3652 | if (scanner_.Next() != Token::STRING) { |
| 3653 | return ReportUnexpectedToken(); |
| 3654 | } |
| 3655 | Handle<String> key = GetString(); |
| 3656 | if (scanner_.Next() != Token::COLON) { |
| 3657 | return ReportUnexpectedToken(); |
| 3658 | } |
| 3659 | Handle<Object> value = ParseJsonValue(); |
| 3660 | if (value.is_null()) return Handle<Object>::null(); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3661 | uint32_t index; |
| 3662 | if (key->AsArrayIndex(&index)) { |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame^] | 3663 | SetOwnElement(json_object, index, value); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3664 | } else { |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame^] | 3665 | SetLocalPropertyIgnoreAttributes(json_object, key, value, NONE); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3666 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3667 | } while (scanner_.Next() == Token::COMMA); |
| 3668 | if (scanner_.current_token() != Token::RBRACE) { |
| 3669 | return ReportUnexpectedToken(); |
| 3670 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3671 | } |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3672 | return json_object; |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3673 | } |
| 3674 | |
| 3675 | |
| 3676 | // Parse a JSON array. Scanner must be right after '[' token. |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3677 | Handle<Object> JsonParser::ParseJsonArray() { |
| 3678 | ZoneScope zone_scope(DELETE_ON_EXIT); |
| 3679 | ZoneList<Handle<Object> > elements(4); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3680 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3681 | Token::Value token = scanner_.peek(); |
| 3682 | if (token == Token::RBRACK) { |
| 3683 | scanner_.Next(); |
| 3684 | } else { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3685 | if (StackLimitCheck().HasOverflowed()) { |
| 3686 | stack_overflow_ = true; |
| 3687 | return Handle<Object>::null(); |
| 3688 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3689 | do { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3690 | Handle<Object> element = ParseJsonValue(); |
| 3691 | if (element.is_null()) return Handle<Object>::null(); |
| 3692 | elements.Add(element); |
| 3693 | token = scanner_.Next(); |
| 3694 | } while (token == Token::COMMA); |
| 3695 | if (token != Token::RBRACK) { |
| 3696 | return ReportUnexpectedToken(); |
| 3697 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3698 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3699 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3700 | // Allocate a fixed array with all the elements. |
| 3701 | Handle<FixedArray> fast_elements = |
| 3702 | Factory::NewFixedArray(elements.length()); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3703 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3704 | for (int i = 0, n = elements.length(); i < n; i++) { |
| 3705 | fast_elements->set(i, *elements[i]); |
| 3706 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3707 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3708 | return Factory::NewJSArrayWithElements(fast_elements); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 3709 | } |
| 3710 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3711 | // ---------------------------------------------------------------------------- |
| 3712 | // Regular expressions |
| 3713 | |
| 3714 | |
| 3715 | RegExpParser::RegExpParser(FlatStringReader* in, |
| 3716 | Handle<String>* error, |
| 3717 | bool multiline) |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 3718 | : error_(error), |
| 3719 | captures_(NULL), |
| 3720 | in_(in), |
| 3721 | current_(kEndMarker), |
| 3722 | next_pos_(0), |
| 3723 | capture_count_(0), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3724 | has_more_(true), |
| 3725 | multiline_(multiline), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3726 | simple_(false), |
| 3727 | contains_anchor_(false), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3728 | is_scanned_for_captures_(false), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3729 | failed_(false) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3730 | Advance(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3731 | } |
| 3732 | |
| 3733 | |
| 3734 | uc32 RegExpParser::Next() { |
| 3735 | if (has_next()) { |
| 3736 | return in()->Get(next_pos_); |
| 3737 | } else { |
| 3738 | return kEndMarker; |
| 3739 | } |
| 3740 | } |
| 3741 | |
| 3742 | |
| 3743 | void RegExpParser::Advance() { |
| 3744 | if (next_pos_ < in()->length()) { |
| 3745 | StackLimitCheck check; |
| 3746 | if (check.HasOverflowed()) { |
| 3747 | ReportError(CStrVector(Top::kStackOverflowMessage)); |
| 3748 | } else if (Zone::excess_allocation()) { |
| 3749 | ReportError(CStrVector("Regular expression too large")); |
| 3750 | } else { |
| 3751 | current_ = in()->Get(next_pos_); |
| 3752 | next_pos_++; |
| 3753 | } |
| 3754 | } else { |
| 3755 | current_ = kEndMarker; |
| 3756 | has_more_ = false; |
| 3757 | } |
| 3758 | } |
| 3759 | |
| 3760 | |
| 3761 | void RegExpParser::Reset(int pos) { |
| 3762 | next_pos_ = pos; |
| 3763 | Advance(); |
| 3764 | } |
| 3765 | |
| 3766 | |
| 3767 | void RegExpParser::Advance(int dist) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 3768 | next_pos_ += dist - 1; |
| 3769 | Advance(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3770 | } |
| 3771 | |
| 3772 | |
| 3773 | bool RegExpParser::simple() { |
| 3774 | return simple_; |
| 3775 | } |
| 3776 | |
| 3777 | RegExpTree* RegExpParser::ReportError(Vector<const char> message) { |
| 3778 | failed_ = true; |
| 3779 | *error_ = Factory::NewStringFromAscii(message, NOT_TENURED); |
| 3780 | // Zip to the end to make sure the no more input is read. |
| 3781 | current_ = kEndMarker; |
| 3782 | next_pos_ = in()->length(); |
| 3783 | return NULL; |
| 3784 | } |
| 3785 | |
| 3786 | |
| 3787 | // Pattern :: |
| 3788 | // Disjunction |
| 3789 | RegExpTree* RegExpParser::ParsePattern() { |
| 3790 | RegExpTree* result = ParseDisjunction(CHECK_FAILED); |
| 3791 | ASSERT(!has_more()); |
| 3792 | // If the result of parsing is a literal string atom, and it has the |
| 3793 | // same length as the input, then the atom is identical to the input. |
| 3794 | if (result->IsAtom() && result->AsAtom()->length() == in()->length()) { |
| 3795 | simple_ = true; |
| 3796 | } |
| 3797 | return result; |
| 3798 | } |
| 3799 | |
| 3800 | |
| 3801 | // Disjunction :: |
| 3802 | // Alternative |
| 3803 | // Alternative | Disjunction |
| 3804 | // Alternative :: |
| 3805 | // [empty] |
| 3806 | // Term Alternative |
| 3807 | // Term :: |
| 3808 | // Assertion |
| 3809 | // Atom |
| 3810 | // Atom Quantifier |
| 3811 | RegExpTree* RegExpParser::ParseDisjunction() { |
| 3812 | // Used to store current state while parsing subexpressions. |
| 3813 | RegExpParserState initial_state(NULL, INITIAL, 0); |
| 3814 | RegExpParserState* stored_state = &initial_state; |
| 3815 | // Cache the builder in a local variable for quick access. |
| 3816 | RegExpBuilder* builder = initial_state.builder(); |
| 3817 | while (true) { |
| 3818 | switch (current()) { |
| 3819 | case kEndMarker: |
| 3820 | if (stored_state->IsSubexpression()) { |
| 3821 | // Inside a parenthesized group when hitting end of input. |
| 3822 | ReportError(CStrVector("Unterminated group") CHECK_FAILED); |
| 3823 | } |
| 3824 | ASSERT_EQ(INITIAL, stored_state->group_type()); |
| 3825 | // Parsing completed successfully. |
| 3826 | return builder->ToRegExp(); |
| 3827 | case ')': { |
| 3828 | if (!stored_state->IsSubexpression()) { |
| 3829 | ReportError(CStrVector("Unmatched ')'") CHECK_FAILED); |
| 3830 | } |
| 3831 | ASSERT_NE(INITIAL, stored_state->group_type()); |
| 3832 | |
| 3833 | Advance(); |
| 3834 | // End disjunction parsing and convert builder content to new single |
| 3835 | // regexp atom. |
| 3836 | RegExpTree* body = builder->ToRegExp(); |
| 3837 | |
| 3838 | int end_capture_index = captures_started(); |
| 3839 | |
| 3840 | int capture_index = stored_state->capture_index(); |
| 3841 | SubexpressionType type = stored_state->group_type(); |
| 3842 | |
| 3843 | // Restore previous state. |
| 3844 | stored_state = stored_state->previous_state(); |
| 3845 | builder = stored_state->builder(); |
| 3846 | |
| 3847 | // Build result of subexpression. |
| 3848 | if (type == CAPTURE) { |
| 3849 | RegExpCapture* capture = new RegExpCapture(body, capture_index); |
| 3850 | captures_->at(capture_index - 1) = capture; |
| 3851 | body = capture; |
| 3852 | } else if (type != GROUPING) { |
| 3853 | ASSERT(type == POSITIVE_LOOKAHEAD || type == NEGATIVE_LOOKAHEAD); |
| 3854 | bool is_positive = (type == POSITIVE_LOOKAHEAD); |
| 3855 | body = new RegExpLookahead(body, |
| 3856 | is_positive, |
| 3857 | end_capture_index - capture_index, |
| 3858 | capture_index); |
| 3859 | } |
| 3860 | builder->AddAtom(body); |
| 3861 | break; |
| 3862 | } |
| 3863 | case '|': { |
| 3864 | Advance(); |
| 3865 | builder->NewAlternative(); |
| 3866 | continue; |
| 3867 | } |
| 3868 | case '*': |
| 3869 | case '+': |
| 3870 | case '?': |
| 3871 | return ReportError(CStrVector("Nothing to repeat")); |
| 3872 | case '^': { |
| 3873 | Advance(); |
| 3874 | if (multiline_) { |
| 3875 | builder->AddAssertion( |
| 3876 | new RegExpAssertion(RegExpAssertion::START_OF_LINE)); |
| 3877 | } else { |
| 3878 | builder->AddAssertion( |
| 3879 | new RegExpAssertion(RegExpAssertion::START_OF_INPUT)); |
| 3880 | set_contains_anchor(); |
| 3881 | } |
| 3882 | continue; |
| 3883 | } |
| 3884 | case '$': { |
| 3885 | Advance(); |
| 3886 | RegExpAssertion::Type type = |
| 3887 | multiline_ ? RegExpAssertion::END_OF_LINE : |
| 3888 | RegExpAssertion::END_OF_INPUT; |
| 3889 | builder->AddAssertion(new RegExpAssertion(type)); |
| 3890 | continue; |
| 3891 | } |
| 3892 | case '.': { |
| 3893 | Advance(); |
| 3894 | // everything except \x0a, \x0d, \u2028 and \u2029 |
| 3895 | ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| 3896 | CharacterRange::AddClassEscape('.', ranges); |
| 3897 | RegExpTree* atom = new RegExpCharacterClass(ranges, false); |
| 3898 | builder->AddAtom(atom); |
| 3899 | break; |
| 3900 | } |
| 3901 | case '(': { |
| 3902 | SubexpressionType type = CAPTURE; |
| 3903 | Advance(); |
| 3904 | if (current() == '?') { |
| 3905 | switch (Next()) { |
| 3906 | case ':': |
| 3907 | type = GROUPING; |
| 3908 | break; |
| 3909 | case '=': |
| 3910 | type = POSITIVE_LOOKAHEAD; |
| 3911 | break; |
| 3912 | case '!': |
| 3913 | type = NEGATIVE_LOOKAHEAD; |
| 3914 | break; |
| 3915 | default: |
| 3916 | ReportError(CStrVector("Invalid group") CHECK_FAILED); |
| 3917 | break; |
| 3918 | } |
| 3919 | Advance(2); |
| 3920 | } else { |
| 3921 | if (captures_ == NULL) { |
| 3922 | captures_ = new ZoneList<RegExpCapture*>(2); |
| 3923 | } |
| 3924 | if (captures_started() >= kMaxCaptures) { |
| 3925 | ReportError(CStrVector("Too many captures") CHECK_FAILED); |
| 3926 | } |
| 3927 | captures_->Add(NULL); |
| 3928 | } |
| 3929 | // Store current state and begin new disjunction parsing. |
| 3930 | stored_state = new RegExpParserState(stored_state, |
| 3931 | type, |
| 3932 | captures_started()); |
| 3933 | builder = stored_state->builder(); |
| 3934 | break; |
| 3935 | } |
| 3936 | case '[': { |
| 3937 | RegExpTree* atom = ParseCharacterClass(CHECK_FAILED); |
| 3938 | builder->AddAtom(atom); |
| 3939 | break; |
| 3940 | } |
| 3941 | // Atom :: |
| 3942 | // \ AtomEscape |
| 3943 | case '\\': |
| 3944 | switch (Next()) { |
| 3945 | case kEndMarker: |
| 3946 | return ReportError(CStrVector("\\ at end of pattern")); |
| 3947 | case 'b': |
| 3948 | Advance(2); |
| 3949 | builder->AddAssertion( |
| 3950 | new RegExpAssertion(RegExpAssertion::BOUNDARY)); |
| 3951 | continue; |
| 3952 | case 'B': |
| 3953 | Advance(2); |
| 3954 | builder->AddAssertion( |
| 3955 | new RegExpAssertion(RegExpAssertion::NON_BOUNDARY)); |
| 3956 | continue; |
| 3957 | // AtomEscape :: |
| 3958 | // CharacterClassEscape |
| 3959 | // |
| 3960 | // CharacterClassEscape :: one of |
| 3961 | // d D s S w W |
| 3962 | case 'd': case 'D': case 's': case 'S': case 'w': case 'W': { |
| 3963 | uc32 c = Next(); |
| 3964 | Advance(2); |
| 3965 | ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| 3966 | CharacterRange::AddClassEscape(c, ranges); |
| 3967 | RegExpTree* atom = new RegExpCharacterClass(ranges, false); |
| 3968 | builder->AddAtom(atom); |
| 3969 | break; |
| 3970 | } |
| 3971 | case '1': case '2': case '3': case '4': case '5': case '6': |
| 3972 | case '7': case '8': case '9': { |
| 3973 | int index = 0; |
| 3974 | if (ParseBackReferenceIndex(&index)) { |
| 3975 | RegExpCapture* capture = NULL; |
| 3976 | if (captures_ != NULL && index <= captures_->length()) { |
| 3977 | capture = captures_->at(index - 1); |
| 3978 | } |
| 3979 | if (capture == NULL) { |
| 3980 | builder->AddEmpty(); |
| 3981 | break; |
| 3982 | } |
| 3983 | RegExpTree* atom = new RegExpBackReference(capture); |
| 3984 | builder->AddAtom(atom); |
| 3985 | break; |
| 3986 | } |
| 3987 | uc32 first_digit = Next(); |
| 3988 | if (first_digit == '8' || first_digit == '9') { |
| 3989 | // Treat as identity escape |
| 3990 | builder->AddCharacter(first_digit); |
| 3991 | Advance(2); |
| 3992 | break; |
| 3993 | } |
| 3994 | } |
| 3995 | // FALLTHROUGH |
| 3996 | case '0': { |
| 3997 | Advance(); |
| 3998 | uc32 octal = ParseOctalLiteral(); |
| 3999 | builder->AddCharacter(octal); |
| 4000 | break; |
| 4001 | } |
| 4002 | // ControlEscape :: one of |
| 4003 | // f n r t v |
| 4004 | case 'f': |
| 4005 | Advance(2); |
| 4006 | builder->AddCharacter('\f'); |
| 4007 | break; |
| 4008 | case 'n': |
| 4009 | Advance(2); |
| 4010 | builder->AddCharacter('\n'); |
| 4011 | break; |
| 4012 | case 'r': |
| 4013 | Advance(2); |
| 4014 | builder->AddCharacter('\r'); |
| 4015 | break; |
| 4016 | case 't': |
| 4017 | Advance(2); |
| 4018 | builder->AddCharacter('\t'); |
| 4019 | break; |
| 4020 | case 'v': |
| 4021 | Advance(2); |
| 4022 | builder->AddCharacter('\v'); |
| 4023 | break; |
| 4024 | case 'c': { |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame^] | 4025 | Advance(); |
| 4026 | uc32 controlLetter = Next(); |
| 4027 | // Special case if it is an ASCII letter. |
| 4028 | // Convert lower case letters to uppercase. |
| 4029 | uc32 letter = controlLetter & ~('a' ^ 'A'); |
| 4030 | if (letter < 'A' || 'Z' < letter) { |
| 4031 | // controlLetter is not in range 'A'-'Z' or 'a'-'z'. |
| 4032 | // This is outside the specification. We match JSC in |
| 4033 | // reading the backslash as a literal character instead |
| 4034 | // of as starting an escape. |
| 4035 | builder->AddCharacter('\\'); |
| 4036 | } else { |
| 4037 | Advance(2); |
| 4038 | builder->AddCharacter(controlLetter & 0x1f); |
| 4039 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4040 | break; |
| 4041 | } |
| 4042 | case 'x': { |
| 4043 | Advance(2); |
| 4044 | uc32 value; |
| 4045 | if (ParseHexEscape(2, &value)) { |
| 4046 | builder->AddCharacter(value); |
| 4047 | } else { |
| 4048 | builder->AddCharacter('x'); |
| 4049 | } |
| 4050 | break; |
| 4051 | } |
| 4052 | case 'u': { |
| 4053 | Advance(2); |
| 4054 | uc32 value; |
| 4055 | if (ParseHexEscape(4, &value)) { |
| 4056 | builder->AddCharacter(value); |
| 4057 | } else { |
| 4058 | builder->AddCharacter('u'); |
| 4059 | } |
| 4060 | break; |
| 4061 | } |
| 4062 | default: |
| 4063 | // Identity escape. |
| 4064 | builder->AddCharacter(Next()); |
| 4065 | Advance(2); |
| 4066 | break; |
| 4067 | } |
| 4068 | break; |
| 4069 | case '{': { |
| 4070 | int dummy; |
| 4071 | if (ParseIntervalQuantifier(&dummy, &dummy)) { |
| 4072 | ReportError(CStrVector("Nothing to repeat") CHECK_FAILED); |
| 4073 | } |
| 4074 | // fallthrough |
| 4075 | } |
| 4076 | default: |
| 4077 | builder->AddCharacter(current()); |
| 4078 | Advance(); |
| 4079 | break; |
| 4080 | } // end switch(current()) |
| 4081 | |
| 4082 | int min; |
| 4083 | int max; |
| 4084 | switch (current()) { |
| 4085 | // QuantifierPrefix :: |
| 4086 | // * |
| 4087 | // + |
| 4088 | // ? |
| 4089 | // { |
| 4090 | case '*': |
| 4091 | min = 0; |
| 4092 | max = RegExpTree::kInfinity; |
| 4093 | Advance(); |
| 4094 | break; |
| 4095 | case '+': |
| 4096 | min = 1; |
| 4097 | max = RegExpTree::kInfinity; |
| 4098 | Advance(); |
| 4099 | break; |
| 4100 | case '?': |
| 4101 | min = 0; |
| 4102 | max = 1; |
| 4103 | Advance(); |
| 4104 | break; |
| 4105 | case '{': |
| 4106 | if (ParseIntervalQuantifier(&min, &max)) { |
| 4107 | if (max < min) { |
| 4108 | ReportError(CStrVector("numbers out of order in {} quantifier.") |
| 4109 | CHECK_FAILED); |
| 4110 | } |
| 4111 | break; |
| 4112 | } else { |
| 4113 | continue; |
| 4114 | } |
| 4115 | default: |
| 4116 | continue; |
| 4117 | } |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 4118 | RegExpQuantifier::Type type = RegExpQuantifier::GREEDY; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4119 | if (current() == '?') { |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 4120 | type = RegExpQuantifier::NON_GREEDY; |
| 4121 | Advance(); |
| 4122 | } else if (FLAG_regexp_possessive_quantifier && current() == '+') { |
| 4123 | // FLAG_regexp_possessive_quantifier is a debug-only flag. |
| 4124 | type = RegExpQuantifier::POSSESSIVE; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4125 | Advance(); |
| 4126 | } |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 4127 | builder->AddQuantifierToAtom(min, max, type); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4128 | } |
| 4129 | } |
| 4130 | |
| 4131 | class SourceCharacter { |
| 4132 | public: |
| 4133 | static bool Is(uc32 c) { |
| 4134 | switch (c) { |
| 4135 | // case ']': case '}': |
| 4136 | // In spidermonkey and jsc these are treated as source characters |
| 4137 | // so we do too. |
| 4138 | case '^': case '$': case '\\': case '.': case '*': case '+': |
| 4139 | case '?': case '(': case ')': case '[': case '{': case '|': |
| 4140 | case RegExpParser::kEndMarker: |
| 4141 | return false; |
| 4142 | default: |
| 4143 | return true; |
| 4144 | } |
| 4145 | } |
| 4146 | }; |
| 4147 | |
| 4148 | |
| 4149 | static unibrow::Predicate<SourceCharacter> source_character; |
| 4150 | |
| 4151 | |
| 4152 | static inline bool IsSourceCharacter(uc32 c) { |
| 4153 | return source_character.get(c); |
| 4154 | } |
| 4155 | |
| 4156 | #ifdef DEBUG |
| 4157 | // Currently only used in an ASSERT. |
| 4158 | static bool IsSpecialClassEscape(uc32 c) { |
| 4159 | switch (c) { |
| 4160 | case 'd': case 'D': |
| 4161 | case 's': case 'S': |
| 4162 | case 'w': case 'W': |
| 4163 | return true; |
| 4164 | default: |
| 4165 | return false; |
| 4166 | } |
| 4167 | } |
| 4168 | #endif |
| 4169 | |
| 4170 | |
| 4171 | // In order to know whether an escape is a backreference or not we have to scan |
| 4172 | // the entire regexp and find the number of capturing parentheses. However we |
| 4173 | // don't want to scan the regexp twice unless it is necessary. This mini-parser |
| 4174 | // is called when needed. It can see the difference between capturing and |
| 4175 | // noncapturing parentheses and can skip character classes and backslash-escaped |
| 4176 | // characters. |
| 4177 | void RegExpParser::ScanForCaptures() { |
| 4178 | // Start with captures started previous to current position |
| 4179 | int capture_count = captures_started(); |
| 4180 | // Add count of captures after this position. |
| 4181 | int n; |
| 4182 | while ((n = current()) != kEndMarker) { |
| 4183 | Advance(); |
| 4184 | switch (n) { |
| 4185 | case '\\': |
| 4186 | Advance(); |
| 4187 | break; |
| 4188 | case '[': { |
| 4189 | int c; |
| 4190 | while ((c = current()) != kEndMarker) { |
| 4191 | Advance(); |
| 4192 | if (c == '\\') { |
| 4193 | Advance(); |
| 4194 | } else { |
| 4195 | if (c == ']') break; |
| 4196 | } |
| 4197 | } |
| 4198 | break; |
| 4199 | } |
| 4200 | case '(': |
| 4201 | if (current() != '?') capture_count++; |
| 4202 | break; |
| 4203 | } |
| 4204 | } |
| 4205 | capture_count_ = capture_count; |
| 4206 | is_scanned_for_captures_ = true; |
| 4207 | } |
| 4208 | |
| 4209 | |
| 4210 | bool RegExpParser::ParseBackReferenceIndex(int* index_out) { |
| 4211 | ASSERT_EQ('\\', current()); |
| 4212 | ASSERT('1' <= Next() && Next() <= '9'); |
| 4213 | // Try to parse a decimal literal that is no greater than the total number |
| 4214 | // of left capturing parentheses in the input. |
| 4215 | int start = position(); |
| 4216 | int value = Next() - '0'; |
| 4217 | Advance(2); |
| 4218 | while (true) { |
| 4219 | uc32 c = current(); |
| 4220 | if (IsDecimalDigit(c)) { |
| 4221 | value = 10 * value + (c - '0'); |
| 4222 | if (value > kMaxCaptures) { |
| 4223 | Reset(start); |
| 4224 | return false; |
| 4225 | } |
| 4226 | Advance(); |
| 4227 | } else { |
| 4228 | break; |
| 4229 | } |
| 4230 | } |
| 4231 | if (value > captures_started()) { |
| 4232 | if (!is_scanned_for_captures_) { |
| 4233 | int saved_position = position(); |
| 4234 | ScanForCaptures(); |
| 4235 | Reset(saved_position); |
| 4236 | } |
| 4237 | if (value > capture_count_) { |
| 4238 | Reset(start); |
| 4239 | return false; |
| 4240 | } |
| 4241 | } |
| 4242 | *index_out = value; |
| 4243 | return true; |
| 4244 | } |
| 4245 | |
| 4246 | |
| 4247 | // QuantifierPrefix :: |
| 4248 | // { DecimalDigits } |
| 4249 | // { DecimalDigits , } |
| 4250 | // { DecimalDigits , DecimalDigits } |
| 4251 | // |
| 4252 | // Returns true if parsing succeeds, and set the min_out and max_out |
| 4253 | // values. Values are truncated to RegExpTree::kInfinity if they overflow. |
| 4254 | bool RegExpParser::ParseIntervalQuantifier(int* min_out, int* max_out) { |
| 4255 | ASSERT_EQ(current(), '{'); |
| 4256 | int start = position(); |
| 4257 | Advance(); |
| 4258 | int min = 0; |
| 4259 | if (!IsDecimalDigit(current())) { |
| 4260 | Reset(start); |
| 4261 | return false; |
| 4262 | } |
| 4263 | while (IsDecimalDigit(current())) { |
| 4264 | int next = current() - '0'; |
| 4265 | if (min > (RegExpTree::kInfinity - next) / 10) { |
| 4266 | // Overflow. Skip past remaining decimal digits and return -1. |
| 4267 | do { |
| 4268 | Advance(); |
| 4269 | } while (IsDecimalDigit(current())); |
| 4270 | min = RegExpTree::kInfinity; |
| 4271 | break; |
| 4272 | } |
| 4273 | min = 10 * min + next; |
| 4274 | Advance(); |
| 4275 | } |
| 4276 | int max = 0; |
| 4277 | if (current() == '}') { |
| 4278 | max = min; |
| 4279 | Advance(); |
| 4280 | } else if (current() == ',') { |
| 4281 | Advance(); |
| 4282 | if (current() == '}') { |
| 4283 | max = RegExpTree::kInfinity; |
| 4284 | Advance(); |
| 4285 | } else { |
| 4286 | while (IsDecimalDigit(current())) { |
| 4287 | int next = current() - '0'; |
| 4288 | if (max > (RegExpTree::kInfinity - next) / 10) { |
| 4289 | do { |
| 4290 | Advance(); |
| 4291 | } while (IsDecimalDigit(current())); |
| 4292 | max = RegExpTree::kInfinity; |
| 4293 | break; |
| 4294 | } |
| 4295 | max = 10 * max + next; |
| 4296 | Advance(); |
| 4297 | } |
| 4298 | if (current() != '}') { |
| 4299 | Reset(start); |
| 4300 | return false; |
| 4301 | } |
| 4302 | Advance(); |
| 4303 | } |
| 4304 | } else { |
| 4305 | Reset(start); |
| 4306 | return false; |
| 4307 | } |
| 4308 | *min_out = min; |
| 4309 | *max_out = max; |
| 4310 | return true; |
| 4311 | } |
| 4312 | |
| 4313 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4314 | uc32 RegExpParser::ParseOctalLiteral() { |
| 4315 | ASSERT('0' <= current() && current() <= '7'); |
| 4316 | // For compatibility with some other browsers (not all), we parse |
| 4317 | // up to three octal digits with a value below 256. |
| 4318 | uc32 value = current() - '0'; |
| 4319 | Advance(); |
| 4320 | if ('0' <= current() && current() <= '7') { |
| 4321 | value = value * 8 + current() - '0'; |
| 4322 | Advance(); |
| 4323 | if (value < 32 && '0' <= current() && current() <= '7') { |
| 4324 | value = value * 8 + current() - '0'; |
| 4325 | Advance(); |
| 4326 | } |
| 4327 | } |
| 4328 | return value; |
| 4329 | } |
| 4330 | |
| 4331 | |
| 4332 | bool RegExpParser::ParseHexEscape(int length, uc32 *value) { |
| 4333 | int start = position(); |
| 4334 | uc32 val = 0; |
| 4335 | bool done = false; |
| 4336 | for (int i = 0; !done; i++) { |
| 4337 | uc32 c = current(); |
| 4338 | int d = HexValue(c); |
| 4339 | if (d < 0) { |
| 4340 | Reset(start); |
| 4341 | return false; |
| 4342 | } |
| 4343 | val = val * 16 + d; |
| 4344 | Advance(); |
| 4345 | if (i == length - 1) { |
| 4346 | done = true; |
| 4347 | } |
| 4348 | } |
| 4349 | *value = val; |
| 4350 | return true; |
| 4351 | } |
| 4352 | |
| 4353 | |
| 4354 | uc32 RegExpParser::ParseClassCharacterEscape() { |
| 4355 | ASSERT(current() == '\\'); |
| 4356 | ASSERT(has_next() && !IsSpecialClassEscape(Next())); |
| 4357 | Advance(); |
| 4358 | switch (current()) { |
| 4359 | case 'b': |
| 4360 | Advance(); |
| 4361 | return '\b'; |
| 4362 | // ControlEscape :: one of |
| 4363 | // f n r t v |
| 4364 | case 'f': |
| 4365 | Advance(); |
| 4366 | return '\f'; |
| 4367 | case 'n': |
| 4368 | Advance(); |
| 4369 | return '\n'; |
| 4370 | case 'r': |
| 4371 | Advance(); |
| 4372 | return '\r'; |
| 4373 | case 't': |
| 4374 | Advance(); |
| 4375 | return '\t'; |
| 4376 | case 'v': |
| 4377 | Advance(); |
| 4378 | return '\v'; |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame^] | 4379 | case 'c': { |
| 4380 | uc32 controlLetter = Next(); |
| 4381 | uc32 letter = controlLetter & ~('A' ^ 'a'); |
| 4382 | // For compatibility with JSC, inside a character class |
| 4383 | // we also accept digits and underscore as control characters. |
| 4384 | if ((controlLetter >= '0' && controlLetter <= '9') || |
| 4385 | controlLetter == '_' || |
| 4386 | (letter >= 'A' && letter <= 'Z')) { |
| 4387 | Advance(2); |
| 4388 | // Control letters mapped to ASCII control characters in the range |
| 4389 | // 0x00-0x1f. |
| 4390 | return controlLetter & 0x1f; |
| 4391 | } |
| 4392 | // We match JSC in reading the backslash as a literal |
| 4393 | // character instead of as starting an escape. |
| 4394 | return '\\'; |
| 4395 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4396 | case '0': case '1': case '2': case '3': case '4': case '5': |
| 4397 | case '6': case '7': |
| 4398 | // For compatibility, we interpret a decimal escape that isn't |
| 4399 | // a back reference (and therefore either \0 or not valid according |
| 4400 | // to the specification) as a 1..3 digit octal character code. |
| 4401 | return ParseOctalLiteral(); |
| 4402 | case 'x': { |
| 4403 | Advance(); |
| 4404 | uc32 value; |
| 4405 | if (ParseHexEscape(2, &value)) { |
| 4406 | return value; |
| 4407 | } |
| 4408 | // If \x is not followed by a two-digit hexadecimal, treat it |
| 4409 | // as an identity escape. |
| 4410 | return 'x'; |
| 4411 | } |
| 4412 | case 'u': { |
| 4413 | Advance(); |
| 4414 | uc32 value; |
| 4415 | if (ParseHexEscape(4, &value)) { |
| 4416 | return value; |
| 4417 | } |
| 4418 | // If \u is not followed by a four-digit hexadecimal, treat it |
| 4419 | // as an identity escape. |
| 4420 | return 'u'; |
| 4421 | } |
| 4422 | default: { |
| 4423 | // Extended identity escape. We accept any character that hasn't |
| 4424 | // been matched by a more specific case, not just the subset required |
| 4425 | // by the ECMAScript specification. |
| 4426 | uc32 result = current(); |
| 4427 | Advance(); |
| 4428 | return result; |
| 4429 | } |
| 4430 | } |
| 4431 | return 0; |
| 4432 | } |
| 4433 | |
| 4434 | |
| 4435 | CharacterRange RegExpParser::ParseClassAtom(uc16* char_class) { |
| 4436 | ASSERT_EQ(0, *char_class); |
| 4437 | uc32 first = current(); |
| 4438 | if (first == '\\') { |
| 4439 | switch (Next()) { |
| 4440 | case 'w': case 'W': case 'd': case 'D': case 's': case 'S': { |
| 4441 | *char_class = Next(); |
| 4442 | Advance(2); |
| 4443 | return CharacterRange::Singleton(0); // Return dummy value. |
| 4444 | } |
| 4445 | case kEndMarker: |
| 4446 | return ReportError(CStrVector("\\ at end of pattern")); |
| 4447 | default: |
| 4448 | uc32 c = ParseClassCharacterEscape(CHECK_FAILED); |
| 4449 | return CharacterRange::Singleton(c); |
| 4450 | } |
| 4451 | } else { |
| 4452 | Advance(); |
| 4453 | return CharacterRange::Singleton(first); |
| 4454 | } |
| 4455 | } |
| 4456 | |
| 4457 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4458 | static const uc16 kNoCharClass = 0; |
| 4459 | |
| 4460 | // Adds range or pre-defined character class to character ranges. |
| 4461 | // If char_class is not kInvalidClass, it's interpreted as a class |
| 4462 | // escape (i.e., 's' means whitespace, from '\s'). |
| 4463 | static inline void AddRangeOrEscape(ZoneList<CharacterRange>* ranges, |
| 4464 | uc16 char_class, |
| 4465 | CharacterRange range) { |
| 4466 | if (char_class != kNoCharClass) { |
| 4467 | CharacterRange::AddClassEscape(char_class, ranges); |
| 4468 | } else { |
| 4469 | ranges->Add(range); |
| 4470 | } |
| 4471 | } |
| 4472 | |
| 4473 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4474 | RegExpTree* RegExpParser::ParseCharacterClass() { |
| 4475 | static const char* kUnterminated = "Unterminated character class"; |
| 4476 | static const char* kRangeOutOfOrder = "Range out of order in character class"; |
| 4477 | |
| 4478 | ASSERT_EQ(current(), '['); |
| 4479 | Advance(); |
| 4480 | bool is_negated = false; |
| 4481 | if (current() == '^') { |
| 4482 | is_negated = true; |
| 4483 | Advance(); |
| 4484 | } |
| 4485 | ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| 4486 | while (has_more() && current() != ']') { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4487 | uc16 char_class = kNoCharClass; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4488 | CharacterRange first = ParseClassAtom(&char_class CHECK_FAILED); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4489 | if (current() == '-') { |
| 4490 | Advance(); |
| 4491 | if (current() == kEndMarker) { |
| 4492 | // If we reach the end we break out of the loop and let the |
| 4493 | // following code report an error. |
| 4494 | break; |
| 4495 | } else if (current() == ']') { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4496 | AddRangeOrEscape(ranges, char_class, first); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4497 | ranges->Add(CharacterRange::Singleton('-')); |
| 4498 | break; |
| 4499 | } |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4500 | uc16 char_class_2 = kNoCharClass; |
| 4501 | CharacterRange next = ParseClassAtom(&char_class_2 CHECK_FAILED); |
| 4502 | if (char_class != kNoCharClass || char_class_2 != kNoCharClass) { |
| 4503 | // Either end is an escaped character class. Treat the '-' verbatim. |
| 4504 | AddRangeOrEscape(ranges, char_class, first); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4505 | ranges->Add(CharacterRange::Singleton('-')); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4506 | AddRangeOrEscape(ranges, char_class_2, next); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4507 | continue; |
| 4508 | } |
| 4509 | if (first.from() > next.to()) { |
| 4510 | return ReportError(CStrVector(kRangeOutOfOrder) CHECK_FAILED); |
| 4511 | } |
| 4512 | ranges->Add(CharacterRange::Range(first.from(), next.to())); |
| 4513 | } else { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4514 | AddRangeOrEscape(ranges, char_class, first); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4515 | } |
| 4516 | } |
| 4517 | if (!has_more()) { |
| 4518 | return ReportError(CStrVector(kUnterminated) CHECK_FAILED); |
| 4519 | } |
| 4520 | Advance(); |
| 4521 | if (ranges->length() == 0) { |
| 4522 | ranges->Add(CharacterRange::Everything()); |
| 4523 | is_negated = !is_negated; |
| 4524 | } |
| 4525 | return new RegExpCharacterClass(ranges, is_negated); |
| 4526 | } |
| 4527 | |
| 4528 | |
| 4529 | // ---------------------------------------------------------------------------- |
| 4530 | // The Parser interface. |
| 4531 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4532 | ParserMessage::~ParserMessage() { |
| 4533 | for (int i = 0; i < args().length(); i++) |
| 4534 | DeleteArray(args()[i]); |
| 4535 | DeleteArray(args().start()); |
| 4536 | } |
| 4537 | |
| 4538 | |
| 4539 | ScriptDataImpl::~ScriptDataImpl() { |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 4540 | if (owns_store_) store_.Dispose(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4541 | } |
| 4542 | |
| 4543 | |
| 4544 | int ScriptDataImpl::Length() { |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 4545 | return store_.length() * sizeof(unsigned); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4546 | } |
| 4547 | |
| 4548 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 4549 | const char* ScriptDataImpl::Data() { |
| 4550 | return reinterpret_cast<const char*>(store_.start()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4551 | } |
| 4552 | |
| 4553 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 4554 | bool ScriptDataImpl::HasError() { |
| 4555 | return has_error(); |
| 4556 | } |
| 4557 | |
| 4558 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 4559 | void ScriptDataImpl::Initialize() { |
| 4560 | // Prepares state for use. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4561 | if (store_.length() >= PreparseDataConstants::kHeaderSize) { |
| 4562 | function_index_ = PreparseDataConstants::kHeaderSize; |
| 4563 | int symbol_data_offset = PreparseDataConstants::kHeaderSize |
| 4564 | + store_[PreparseDataConstants::kFunctionsSizeOffset]; |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 4565 | if (store_.length() > symbol_data_offset) { |
| 4566 | symbol_data_ = reinterpret_cast<byte*>(&store_[symbol_data_offset]); |
| 4567 | } else { |
| 4568 | // Partial preparse causes no symbol information. |
| 4569 | symbol_data_ = reinterpret_cast<byte*>(&store_[0] + store_.length()); |
| 4570 | } |
| 4571 | symbol_data_end_ = reinterpret_cast<byte*>(&store_[0] + store_.length()); |
| 4572 | } |
| 4573 | } |
| 4574 | |
| 4575 | |
| 4576 | int ScriptDataImpl::ReadNumber(byte** source) { |
| 4577 | // Reads a number from symbol_data_ in base 128. The most significant |
| 4578 | // bit marks that there are more digits. |
| 4579 | // If the first byte is 0x80 (kNumberTerminator), it would normally |
| 4580 | // represent a leading zero. Since that is useless, and therefore won't |
| 4581 | // appear as the first digit of any actual value, it is used to |
| 4582 | // mark the end of the input stream. |
| 4583 | byte* data = *source; |
| 4584 | if (data >= symbol_data_end_) return -1; |
| 4585 | byte input = *data; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4586 | if (input == PreparseDataConstants::kNumberTerminator) { |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 4587 | // End of stream marker. |
| 4588 | return -1; |
| 4589 | } |
| 4590 | int result = input & 0x7f; |
| 4591 | data++; |
| 4592 | while ((input & 0x80u) != 0) { |
| 4593 | if (data >= symbol_data_end_) return -1; |
| 4594 | input = *data; |
| 4595 | result = (result << 7) | (input & 0x7f); |
| 4596 | data++; |
| 4597 | } |
| 4598 | *source = data; |
| 4599 | return result; |
| 4600 | } |
| 4601 | |
| 4602 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4603 | // Create a Scanner for the preparser to use as input, and preparse the source. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4604 | static ScriptDataImpl* DoPreParse(UC16CharacterStream* source, |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4605 | bool allow_lazy, |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 4606 | ParserRecorder* recorder) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4607 | V8JavaScriptScanner scanner; |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 4608 | scanner.Initialize(source); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4609 | intptr_t stack_limit = StackGuard::real_climit(); |
| 4610 | if (!preparser::PreParser::PreParseProgram(&scanner, |
| 4611 | recorder, |
| 4612 | allow_lazy, |
| 4613 | stack_limit)) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4614 | Top::StackOverflow(); |
| 4615 | return NULL; |
| 4616 | } |
| 4617 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 4618 | // Extract the accumulated data from the recorder as a single |
| 4619 | // contiguous vector that we are responsible for disposing. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4620 | Vector<unsigned> store = recorder->ExtractData(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4621 | return new ScriptDataImpl(store); |
| 4622 | } |
| 4623 | |
| 4624 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4625 | // Preparse, but only collect data that is immediately useful, |
| 4626 | // even if the preparser data is only used once. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4627 | ScriptDataImpl* ParserApi::PartialPreParse(UC16CharacterStream* source, |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4628 | v8::Extension* extension) { |
| 4629 | bool allow_lazy = FLAG_lazy && (extension == NULL); |
| 4630 | if (!allow_lazy) { |
| 4631 | // Partial preparsing is only about lazily compiled functions. |
| 4632 | // If we don't allow lazy compilation, the log data will be empty. |
| 4633 | return NULL; |
| 4634 | } |
| 4635 | PartialParserRecorder recorder; |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 4636 | return DoPreParse(source, allow_lazy, &recorder); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4637 | } |
| 4638 | |
| 4639 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 4640 | ScriptDataImpl* ParserApi::PreParse(UC16CharacterStream* source, |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4641 | v8::Extension* extension) { |
| 4642 | Handle<Script> no_script; |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4643 | bool allow_lazy = FLAG_lazy && (extension == NULL); |
| 4644 | CompleteParserRecorder recorder; |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 4645 | return DoPreParse(source, allow_lazy, &recorder); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4646 | } |
| 4647 | |
| 4648 | |
| 4649 | bool RegExpParser::ParseRegExp(FlatStringReader* input, |
| 4650 | bool multiline, |
| 4651 | RegExpCompileData* result) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4652 | ASSERT(result != NULL); |
| 4653 | RegExpParser parser(input, &result->error, multiline); |
| 4654 | RegExpTree* tree = parser.ParsePattern(); |
| 4655 | if (parser.failed()) { |
| 4656 | ASSERT(tree == NULL); |
| 4657 | ASSERT(!result->error.is_null()); |
| 4658 | } else { |
| 4659 | ASSERT(tree != NULL); |
| 4660 | ASSERT(result->error.is_null()); |
| 4661 | result->tree = tree; |
| 4662 | int capture_count = parser.captures_started(); |
| 4663 | result->simple = tree->IsAtom() && parser.simple() && capture_count == 0; |
| 4664 | result->contains_anchor = parser.contains_anchor(); |
| 4665 | result->capture_count = capture_count; |
| 4666 | } |
| 4667 | return !parser.failed(); |
| 4668 | } |
| 4669 | |
| 4670 | |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4671 | bool ParserApi::Parse(CompilationInfo* info) { |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4672 | ASSERT(info->function() == NULL); |
| 4673 | FunctionLiteral* result = NULL; |
| 4674 | Handle<Script> script = info->script(); |
| 4675 | if (info->is_lazy()) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4676 | Parser parser(script, true, NULL, NULL); |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4677 | result = parser.ParseLazy(info->shared_info()); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 4678 | } else { |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4679 | bool allow_natives_syntax = |
| 4680 | FLAG_allow_natives_syntax || Bootstrapper::IsActive(); |
| 4681 | ScriptDataImpl* pre_data = info->pre_parse_data(); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4682 | Parser parser(script, allow_natives_syntax, info->extension(), pre_data); |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4683 | if (pre_data != NULL && pre_data->has_error()) { |
| 4684 | Scanner::Location loc = pre_data->MessageLocation(); |
| 4685 | const char* message = pre_data->BuildMessage(); |
| 4686 | Vector<const char*> args = pre_data->BuildArgs(); |
| 4687 | parser.ReportMessageAt(loc, message, args); |
| 4688 | DeleteArray(message); |
| 4689 | for (int i = 0; i < args.length(); i++) { |
| 4690 | DeleteArray(args[i]); |
| 4691 | } |
| 4692 | DeleteArray(args.start()); |
| 4693 | ASSERT(Top::has_pending_exception()); |
| 4694 | } else { |
| 4695 | Handle<String> source = Handle<String>(String::cast(script->source())); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 4696 | result = parser.ParseProgram(source, info->is_global()); |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4697 | } |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 4698 | } |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 4699 | |
| 4700 | info->SetFunction(result); |
| 4701 | return (result != NULL); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4702 | } |
| 4703 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4704 | } } // namespace v8::internal |