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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_PREPARSER_H | 5 #ifndef V8_PREPARSER_H |
6 #define V8_PREPARSER_H | 6 #define V8_PREPARSER_H |
7 | 7 |
8 #include "src/v8.h" | 8 #include "src/v8.h" |
9 | 9 |
10 #include "src/bailout-reason.h" | 10 #include "src/bailout-reason.h" |
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95 bool allow_arrow_functions() const { return allow_arrow_functions_; } | 95 bool allow_arrow_functions() const { return allow_arrow_functions_; } |
96 bool allow_modules() const { return scanner()->HarmonyModules(); } | 96 bool allow_modules() const { return scanner()->HarmonyModules(); } |
97 bool allow_harmony_scoping() const { return scanner()->HarmonyScoping(); } | 97 bool allow_harmony_scoping() const { return scanner()->HarmonyScoping(); } |
98 bool allow_harmony_numeric_literals() const { | 98 bool allow_harmony_numeric_literals() const { |
99 return scanner()->HarmonyNumericLiterals(); | 99 return scanner()->HarmonyNumericLiterals(); |
100 } | 100 } |
101 bool allow_classes() const { return scanner()->HarmonyClasses(); } | 101 bool allow_classes() const { return scanner()->HarmonyClasses(); } |
102 bool allow_harmony_object_literals() const { | 102 bool allow_harmony_object_literals() const { |
103 return allow_harmony_object_literals_; | 103 return allow_harmony_object_literals_; |
104 } | 104 } |
105 bool allow_harmony_templates() const { return scanner()->HarmonyTemplates(); } | |
105 | 106 |
106 // Setters that determine whether certain syntactical constructs are | 107 // Setters that determine whether certain syntactical constructs are |
107 // allowed to be parsed by this instance of the parser. | 108 // allowed to be parsed by this instance of the parser. |
108 void set_allow_lazy(bool allow) { allow_lazy_ = allow; } | 109 void set_allow_lazy(bool allow) { allow_lazy_ = allow; } |
109 void set_allow_natives_syntax(bool allow) { allow_natives_syntax_ = allow; } | 110 void set_allow_natives_syntax(bool allow) { allow_natives_syntax_ = allow; } |
110 void set_allow_arrow_functions(bool allow) { allow_arrow_functions_ = allow; } | 111 void set_allow_arrow_functions(bool allow) { allow_arrow_functions_ = allow; } |
111 void set_allow_modules(bool allow) { scanner()->SetHarmonyModules(allow); } | 112 void set_allow_modules(bool allow) { scanner()->SetHarmonyModules(allow); } |
112 void set_allow_harmony_scoping(bool allow) { | 113 void set_allow_harmony_scoping(bool allow) { |
113 scanner()->SetHarmonyScoping(allow); | 114 scanner()->SetHarmonyScoping(allow); |
114 } | 115 } |
115 void set_allow_harmony_numeric_literals(bool allow) { | 116 void set_allow_harmony_numeric_literals(bool allow) { |
116 scanner()->SetHarmonyNumericLiterals(allow); | 117 scanner()->SetHarmonyNumericLiterals(allow); |
117 } | 118 } |
118 void set_allow_classes(bool allow) { scanner()->SetHarmonyClasses(allow); } | 119 void set_allow_classes(bool allow) { scanner()->SetHarmonyClasses(allow); } |
119 void set_allow_harmony_object_literals(bool allow) { | 120 void set_allow_harmony_object_literals(bool allow) { |
120 allow_harmony_object_literals_ = allow; | 121 allow_harmony_object_literals_ = allow; |
121 } | 122 } |
123 void set_allow_harmony_templates(bool allow) { | |
124 scanner()->SetHarmonyTemplates(allow); | |
125 } | |
122 | 126 |
123 protected: | 127 protected: |
124 enum AllowEvalOrArgumentsAsIdentifier { | 128 enum AllowEvalOrArgumentsAsIdentifier { |
125 kAllowEvalOrArguments, | 129 kAllowEvalOrArguments, |
126 kDontAllowEvalOrArguments | 130 kDontAllowEvalOrArguments |
127 }; | 131 }; |
128 | 132 |
129 enum Mode { | 133 enum Mode { |
130 PARSE_LAZILY, | 134 PARSE_LAZILY, |
131 PARSE_EAGERLY | 135 PARSE_EAGERLY |
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487 ExpressionT ParseMemberWithNewPrefixesExpression(bool* ok); | 491 ExpressionT ParseMemberWithNewPrefixesExpression(bool* ok); |
488 ExpressionT ParseMemberExpression(bool* ok); | 492 ExpressionT ParseMemberExpression(bool* ok); |
489 ExpressionT ParseMemberExpressionContinuation(ExpressionT expression, | 493 ExpressionT ParseMemberExpressionContinuation(ExpressionT expression, |
490 bool* ok); | 494 bool* ok); |
491 ExpressionT ParseArrowFunctionLiteral(int start_pos, ExpressionT params_ast, | 495 ExpressionT ParseArrowFunctionLiteral(int start_pos, ExpressionT params_ast, |
492 bool* ok); | 496 bool* ok); |
493 ExpressionT ParseClassLiteral(IdentifierT name, | 497 ExpressionT ParseClassLiteral(IdentifierT name, |
494 Scanner::Location function_name_location, | 498 Scanner::Location function_name_location, |
495 bool name_is_strict_reserved, int pos, | 499 bool name_is_strict_reserved, int pos, |
496 bool* ok); | 500 bool* ok); |
501 ExpressionT ParseTemplateLiteral(ExpressionT tag, int start, bool* ok); | |
502 void AddTemplateExpression(ExpressionT); | |
497 | 503 |
498 // Checks if the expression is a valid reference expression (e.g., on the | 504 // Checks if the expression is a valid reference expression (e.g., on the |
499 // left-hand side of assignments). Although ruled out by ECMA as early errors, | 505 // left-hand side of assignments). Although ruled out by ECMA as early errors, |
500 // we allow calls for web compatibility and rewrite them to a runtime throw. | 506 // we allow calls for web compatibility and rewrite them to a runtime throw. |
501 ExpressionT CheckAndRewriteReferenceExpression( | 507 ExpressionT CheckAndRewriteReferenceExpression( |
502 ExpressionT expression, | 508 ExpressionT expression, |
503 Scanner::Location location, const char* message, bool* ok); | 509 Scanner::Location location, const char* message, bool* ok); |
504 | 510 |
505 // Used to detect duplicates in object literals. Each of the values | 511 // Used to detect duplicates in object literals. Each of the values |
506 // kGetterProperty, kSetterProperty and kValueProperty represents | 512 // kGetterProperty, kSetterProperty and kValueProperty represents |
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1379 // Utility functions | 1385 // Utility functions |
1380 int DeclareArrowParametersFromExpression(PreParserExpression expression, | 1386 int DeclareArrowParametersFromExpression(PreParserExpression expression, |
1381 PreParserScope* scope, | 1387 PreParserScope* scope, |
1382 Scanner::Location* dupe_loc, | 1388 Scanner::Location* dupe_loc, |
1383 bool* ok) { | 1389 bool* ok) { |
1384 // TODO(aperez): Detect duplicated identifiers in paramlists. | 1390 // TODO(aperez): Detect duplicated identifiers in paramlists. |
1385 *ok = expression.IsValidArrowParamList(); | 1391 *ok = expression.IsValidArrowParamList(); |
1386 return 0; | 1392 return 0; |
1387 } | 1393 } |
1388 | 1394 |
1395 struct TemplateLiteralState {}; | |
1396 | |
1397 TemplateLiteralState OpenTemplateLiteral(int pos) { | |
1398 return TemplateLiteralState(); | |
1399 } | |
1400 void AddTemplateSpan(TemplateLiteralState*, bool) {} | |
1401 void AddTemplateExpression(TemplateLiteralState*, PreParserExpression) {} | |
1402 PreParserExpression CloseTemplateLiteral(TemplateLiteralState*, int, | |
1403 PreParserExpression) { | |
1404 return EmptyExpression(); | |
1405 } | |
1406 PreParserExpression NoTemplateTag() { | |
1407 return PreParserExpression::Default(); | |
1408 } | |
1389 static AstValueFactory* ast_value_factory() { return NULL; } | 1409 static AstValueFactory* ast_value_factory() { return NULL; } |
1390 | 1410 |
1391 void CheckConflictingVarDeclarations(PreParserScope scope, bool* ok) {} | 1411 void CheckConflictingVarDeclarations(PreParserScope scope, bool* ok) {} |
1392 | 1412 |
1393 // Temporary glue; these functions will move to ParserBase. | 1413 // Temporary glue; these functions will move to ParserBase. |
1394 PreParserExpression ParseV8Intrinsic(bool* ok); | 1414 PreParserExpression ParseV8Intrinsic(bool* ok); |
1395 PreParserExpression ParseFunctionLiteral( | 1415 PreParserExpression ParseFunctionLiteral( |
1396 PreParserIdentifier name, Scanner::Location function_name_location, | 1416 PreParserIdentifier name, Scanner::Location function_name_location, |
1397 bool name_is_strict_reserved, FunctionKind kind, | 1417 bool name_is_strict_reserved, FunctionKind kind, |
1398 int function_token_position, FunctionLiteral::FunctionType type, | 1418 int function_token_position, FunctionLiteral::FunctionType type, |
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1749 // 'true' | 1769 // 'true' |
1750 // 'false' | 1770 // 'false' |
1751 // Identifier | 1771 // Identifier |
1752 // Number | 1772 // Number |
1753 // String | 1773 // String |
1754 // ArrayLiteral | 1774 // ArrayLiteral |
1755 // ObjectLiteral | 1775 // ObjectLiteral |
1756 // RegExpLiteral | 1776 // RegExpLiteral |
1757 // ClassLiteral | 1777 // ClassLiteral |
1758 // '(' Expression ')' | 1778 // '(' Expression ')' |
1779 // TemplateLiteral | |
1759 | 1780 |
1760 int pos = peek_position(); | 1781 int pos = peek_position(); |
1761 ExpressionT result = this->EmptyExpression(); | 1782 ExpressionT result = this->EmptyExpression(); |
1762 Token::Value token = peek(); | 1783 Token::Value token = peek(); |
1763 switch (token) { | 1784 switch (token) { |
1764 case Token::THIS: { | 1785 case Token::THIS: { |
1765 Consume(Token::THIS); | 1786 Consume(Token::THIS); |
1766 scope_->RecordThisUsage(); | 1787 scope_->RecordThisUsage(); |
1767 result = this->ThisExpression(scope_, factory()); | 1788 result = this->ThisExpression(scope_, factory()); |
1768 break; | 1789 break; |
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1837 name = ParseIdentifierOrStrictReservedWord(&is_strict_reserved_name, | 1858 name = ParseIdentifierOrStrictReservedWord(&is_strict_reserved_name, |
1838 CHECK_OK); | 1859 CHECK_OK); |
1839 class_name_location = scanner()->location(); | 1860 class_name_location = scanner()->location(); |
1840 } | 1861 } |
1841 result = this->ParseClassLiteral(name, class_name_location, | 1862 result = this->ParseClassLiteral(name, class_name_location, |
1842 is_strict_reserved_name, | 1863 is_strict_reserved_name, |
1843 class_token_position, CHECK_OK); | 1864 class_token_position, CHECK_OK); |
1844 break; | 1865 break; |
1845 } | 1866 } |
1846 | 1867 |
1868 case Token::TEMPLATE_SPAN: | |
1869 case Token::TEMPLATE_TAIL: | |
1870 result = this->ParseTemplateLiteral(Traits::NoTemplateTag(), pos, | |
1871 CHECK_OK); | |
1872 break; | |
1873 | |
1847 case Token::MOD: | 1874 case Token::MOD: |
1848 if (allow_natives_syntax() || extension_ != NULL) { | 1875 if (allow_natives_syntax() || extension_ != NULL) { |
1849 result = this->ParseV8Intrinsic(CHECK_OK); | 1876 result = this->ParseV8Intrinsic(CHECK_OK); |
1850 break; | 1877 break; |
1851 } | 1878 } |
1852 // If we're not allowing special syntax we fall-through to the | 1879 // If we're not allowing special syntax we fall-through to the |
1853 // default case. | 1880 // default case. |
1854 | 1881 |
1855 default: { | 1882 default: { |
1856 Next(); | 1883 Next(); |
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2460 // direct eval calls. These calls are all of the form eval(...), with | 2487 // direct eval calls. These calls are all of the form eval(...), with |
2461 // no explicit receiver. | 2488 // no explicit receiver. |
2462 // These calls are marked as potentially direct eval calls. Whether | 2489 // These calls are marked as potentially direct eval calls. Whether |
2463 // they are actually direct calls to eval is determined at run time. | 2490 // they are actually direct calls to eval is determined at run time. |
2464 this->CheckPossibleEvalCall(result, scope_); | 2491 this->CheckPossibleEvalCall(result, scope_); |
2465 result = factory()->NewCall(result, args, pos); | 2492 result = factory()->NewCall(result, args, pos); |
2466 if (fni_ != NULL) fni_->RemoveLastFunction(); | 2493 if (fni_ != NULL) fni_->RemoveLastFunction(); |
2467 break; | 2494 break; |
2468 } | 2495 } |
2469 | 2496 |
2497 case Token::TEMPLATE_SPAN: | |
2498 case Token::TEMPLATE_TAIL: { | |
2499 int pos; | |
2500 if (scanner()->current_token() == Token::IDENTIFIER) { | |
2501 pos = position(); | |
2502 } else { | |
2503 pos = peek_position(); | |
2504 if (result->IsFunctionLiteral() && mode() == PARSE_EAGERLY) { | |
2505 // If the tag function looks like an IIFE, set_parenthesized() to | |
2506 // force eager compilation. | |
2507 result->AsFunctionLiteral()->set_parenthesized(); | |
2508 } | |
2509 } | |
2510 result = ParseTemplateLiteral(result, pos, CHECK_OK); | |
2511 break; | |
2512 } | |
2513 | |
2470 case Token::PERIOD: { | 2514 case Token::PERIOD: { |
2471 Consume(Token::PERIOD); | 2515 Consume(Token::PERIOD); |
2472 int pos = position(); | 2516 int pos = position(); |
2473 IdentifierT name = ParseIdentifierName(CHECK_OK); | 2517 IdentifierT name = ParseIdentifierName(CHECK_OK); |
2474 result = factory()->NewProperty( | 2518 result = factory()->NewProperty( |
2475 result, factory()->NewStringLiteral(name, pos), pos); | 2519 result, factory()->NewStringLiteral(name, pos), pos); |
2476 if (fni_ != NULL) this->PushLiteralName(fni_, name); | 2520 if (fni_ != NULL) this->PushLiteralName(fni_, name); |
2477 break; | 2521 break; |
2478 } | 2522 } |
2479 | 2523 |
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2807 this->DefaultConstructor(has_extends, scope_, pos, end_pos + 1); | 2851 this->DefaultConstructor(has_extends, scope_, pos, end_pos + 1); |
2808 } | 2852 } |
2809 | 2853 |
2810 return this->ClassExpression(name, extends, constructor, properties, pos, | 2854 return this->ClassExpression(name, extends, constructor, properties, pos, |
2811 end_pos + 1, factory()); | 2855 end_pos + 1, factory()); |
2812 } | 2856 } |
2813 | 2857 |
2814 | 2858 |
2815 template <typename Traits> | 2859 template <typename Traits> |
2816 typename ParserBase<Traits>::ExpressionT | 2860 typename ParserBase<Traits>::ExpressionT |
2861 ParserBase<Traits>::ParseTemplateLiteral(ExpressionT tag, int start, bool* ok) { | |
2862 // A TemplateLiteral is made up of 0 or more TEMPLATE_SPAN tokens (literal | |
2863 // text followed by a substitution expression), finalized by a single | |
2864 // TEMPLATE_TAIL. | |
2865 // | |
2866 // In terms of draft language, TEMPLATE_SPAN may be either the TemplateHead or | |
2867 // TemplateMiddle productions, while TEMPLATE_TAIL is either TemplateTail, or | |
2868 // NoSubstitutionTemplate. | |
2869 // | |
2870 // When parsing a TemplateLiteral, we must have scanned either an initial | |
2871 // TEMPLATE_SPAN, or a TEMPLATE_TAIL. | |
2872 CHECK(peek() == Token::TEMPLATE_SPAN || peek() == Token::TEMPLATE_TAIL); | |
2873 | |
2874 if (peek() == Token::TEMPLATE_SPAN) { | |
2875 Consume(Token::TEMPLATE_SPAN); | |
2876 int pos = position(); | |
2877 typename Traits::TemplateLiteralState ts = Traits::OpenTemplateLiteral(pos); | |
2878 Traits::AddTemplateSpan(&ts, false); | |
2879 Token::Value next; | |
2880 | |
2881 // If we open with a TEMPLATE_SPAN, we must scan the subsequent expression, | |
2882 // and repeat if the following token is a TEMPLATE_SPAN as well (in this | |
2883 // case, representing a TemplateMiddle). | |
2884 | |
2885 do { | |
2886 next = peek(); | |
2887 if (!next) { | |
2888 ReportMessageAt(Scanner::Location(start, peek_position()), | |
2889 "unterminated_template"); | |
2890 *ok = false; | |
2891 return Traits::EmptyExpression(); | |
2892 } | |
2893 | |
2894 int pos = peek_position(); | |
2895 ExpressionT expression = this->ParseExpression(false, CHECK_OK); | |
2896 Traits::AddTemplateExpression(&ts, expression); | |
2897 | |
2898 if (peek() != Token::RBRACE) { | |
2899 ReportMessageAt(Scanner::Location(pos, peek_position()), | |
2900 "unterminated_template_expr"); | |
2901 *ok = false; | |
2902 return Traits::EmptyExpression(); | |
2903 } | |
2904 | |
2905 // If we didn't die parsing that expression, our next token should be a | |
2906 // TEMPLATE_SPAN or TEMPLATE_TAIL. | |
2907 next = scanner()->ScanTemplateSpan(); | |
2908 Next(); | |
2909 | |
2910 if (!next) { | |
2911 ReportMessageAt(Scanner::Location(start, position()), | |
2912 "unterminated_template"); | |
2913 *ok = false; | |
2914 return Traits::EmptyExpression(); | |
2915 } | |
2916 | |
2917 Traits::AddTemplateSpan(&ts, next == Token::TEMPLATE_TAIL); | |
2918 } while (next == Token::TEMPLATE_SPAN); | |
2919 | |
2920 DCHECK_EQ(next, Token::TEMPLATE_TAIL); | |
2921 // Once we've reached a TEMPLATE_TAIL, we can close the TemplateLiteral. | |
2922 return Traits::CloseTemplateLiteral(&ts, start, tag); | |
2923 } | |
2924 | |
2925 // If we reach a TEMPLATE_TAIL first, we are parsing a NoSubstitutionTemplate. | |
rossberg
2014/11/14 12:28:07
Nit: put this alternative into a conditional inste
| |
2926 // In this case we may simply consume the token and build a template with a | |
2927 // single TEMPLATE_SPAN and no expressions. | |
2928 Consume(Token::TEMPLATE_TAIL); | |
2929 int pos = position(); | |
2930 typename Traits::TemplateLiteralState ts = Traits::OpenTemplateLiteral(pos); | |
2931 Traits::AddTemplateSpan(&ts, true); | |
2932 return Traits::CloseTemplateLiteral(&ts, start, tag); | |
2933 } | |
2934 | |
2935 | |
2936 template <typename Traits> | |
2937 typename ParserBase<Traits>::ExpressionT | |
2817 ParserBase<Traits>::CheckAndRewriteReferenceExpression( | 2938 ParserBase<Traits>::CheckAndRewriteReferenceExpression( |
2818 ExpressionT expression, | 2939 ExpressionT expression, |
2819 Scanner::Location location, const char* message, bool* ok) { | 2940 Scanner::Location location, const char* message, bool* ok) { |
2820 if (strict_mode() == STRICT && this->IsIdentifier(expression) && | 2941 if (strict_mode() == STRICT && this->IsIdentifier(expression) && |
2821 this->IsEvalOrArguments(this->AsIdentifier(expression))) { | 2942 this->IsEvalOrArguments(this->AsIdentifier(expression))) { |
2822 this->ReportMessageAt(location, "strict_eval_arguments", false); | 2943 this->ReportMessageAt(location, "strict_eval_arguments", false); |
2823 *ok = false; | 2944 *ok = false; |
2824 return this->EmptyExpression(); | 2945 return this->EmptyExpression(); |
2825 } else if (expression->IsValidReferenceExpression()) { | 2946 } else if (expression->IsValidReferenceExpression()) { |
2826 return expression; | 2947 return expression; |
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2864 DCHECK(IsAccessorAccessorConflict(old_type, type)); | 2985 DCHECK(IsAccessorAccessorConflict(old_type, type)); |
2865 // Both accessors of the same type. | 2986 // Both accessors of the same type. |
2866 parser()->ReportMessage("accessor_get_set"); | 2987 parser()->ReportMessage("accessor_get_set"); |
2867 } | 2988 } |
2868 *ok = false; | 2989 *ok = false; |
2869 } | 2990 } |
2870 } | 2991 } |
2871 } } // v8::internal | 2992 } } // v8::internal |
2872 | 2993 |
2873 #endif // V8_PREPARSER_H | 2994 #endif // V8_PREPARSER_H |
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