| // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "api.h" |
| #include "ast.h" |
| #include "bootstrapper.h" |
| #include "compiler.h" |
| #include "platform.h" |
| #include "runtime.h" |
| #include "parser.h" |
| #include "scopes.h" |
| #include "string-stream.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| class ParserFactory; |
| class ParserLog; |
| class TemporaryScope; |
| class Target; |
| |
| template <typename T> class ZoneListWrapper; |
| |
| |
| // PositionStack is used for on-stack allocation of token positions for |
| // new expressions. Please look at ParseNewExpression. |
| |
| class PositionStack { |
| public: |
| explicit PositionStack(bool* ok) : top_(NULL), ok_(ok) {} |
| ~PositionStack() { ASSERT(!*ok_ || is_empty()); } |
| |
| class Element { |
| public: |
| Element(PositionStack* stack, int value) { |
| previous_ = stack->top(); |
| value_ = value; |
| stack->set_top(this); |
| } |
| |
| private: |
| Element* previous() { return previous_; } |
| int value() { return value_; } |
| friend class PositionStack; |
| Element* previous_; |
| int value_; |
| }; |
| |
| bool is_empty() { return top_ == NULL; } |
| int pop() { |
| ASSERT(!is_empty()); |
| int result = top_->value(); |
| top_ = top_->previous(); |
| return result; |
| } |
| |
| private: |
| Element* top() { return top_; } |
| void set_top(Element* value) { top_ = value; } |
| Element* top_; |
| bool* ok_; |
| }; |
| |
| |
| class Parser { |
| public: |
| Parser(Handle<Script> script, bool allow_natives_syntax, |
| v8::Extension* extension, bool is_pre_parsing, |
| ParserFactory* factory, ParserLog* log, ScriptDataImpl* pre_data); |
| virtual ~Parser() { } |
| |
| // Pre-parse the program from the character stream; returns true on |
| // success, false if a stack-overflow happened during parsing. |
| bool PreParseProgram(Handle<String> source, unibrow::CharacterStream* stream); |
| |
| void ReportMessage(const char* message, Vector<const char*> args); |
| virtual void ReportMessageAt(Scanner::Location loc, |
| const char* message, |
| Vector<const char*> args) = 0; |
| |
| |
| // Returns NULL if parsing failed. |
| FunctionLiteral* ParseProgram(Handle<String> source, |
| unibrow::CharacterStream* stream, |
| bool in_global_context); |
| FunctionLiteral* ParseLazy(Handle<String> source, |
| Handle<String> name, |
| int start_position, bool is_expression); |
| |
| // The minimum number of contiguous assignment that will |
| // be treated as an initialization block. Benchmarks show that |
| // the overhead exceeds the savings below this limit. |
| static const int kMinInitializationBlock = 3; |
| |
| protected: |
| |
| enum Mode { |
| PARSE_LAZILY, |
| PARSE_EAGERLY |
| }; |
| |
| // Report syntax error |
| void ReportUnexpectedToken(Token::Value token); |
| |
| Handle<Script> script_; |
| Scanner scanner_; |
| |
| Scope* top_scope_; |
| int with_nesting_level_; |
| |
| TemporaryScope* temp_scope_; |
| Mode mode_; |
| |
| Target* target_stack_; // for break, continue statements |
| bool allow_natives_syntax_; |
| v8::Extension* extension_; |
| ParserFactory* factory_; |
| ParserLog* log_; |
| bool is_pre_parsing_; |
| ScriptDataImpl* pre_data_; |
| |
| bool inside_with() const { return with_nesting_level_ > 0; } |
| ParserFactory* factory() const { return factory_; } |
| ParserLog* log() const { return log_; } |
| Scanner& scanner() { return scanner_; } |
| Mode mode() const { return mode_; } |
| ScriptDataImpl* pre_data() const { return pre_data_; } |
| |
| // All ParseXXX functions take as the last argument an *ok parameter |
| // which is set to false if parsing failed; it is unchanged otherwise. |
| // By making the 'exception handling' explicit, we are forced to check |
| // for failure at the call sites. |
| void* ParseSourceElements(ZoneListWrapper<Statement>* processor, |
| int end_token, bool* ok); |
| Statement* ParseStatement(ZoneStringList* labels, bool* ok); |
| Statement* ParseFunctionDeclaration(bool* ok); |
| Statement* ParseNativeDeclaration(bool* ok); |
| Block* ParseBlock(ZoneStringList* labels, bool* ok); |
| Block* ParseVariableStatement(bool* ok); |
| Block* ParseVariableDeclarations(bool accept_IN, Expression** var, bool* ok); |
| Statement* ParseExpressionOrLabelledStatement(ZoneStringList* labels, |
| bool* ok); |
| IfStatement* ParseIfStatement(ZoneStringList* labels, bool* ok); |
| Statement* ParseContinueStatement(bool* ok); |
| Statement* ParseBreakStatement(ZoneStringList* labels, bool* ok); |
| Statement* ParseReturnStatement(bool* ok); |
| Block* WithHelper(Expression* obj, |
| ZoneStringList* labels, |
| bool is_catch_block, |
| bool* ok); |
| Statement* ParseWithStatement(ZoneStringList* labels, bool* ok); |
| CaseClause* ParseCaseClause(bool* default_seen_ptr, bool* ok); |
| SwitchStatement* ParseSwitchStatement(ZoneStringList* labels, bool* ok); |
| LoopStatement* ParseDoStatement(ZoneStringList* labels, bool* ok); |
| LoopStatement* ParseWhileStatement(ZoneStringList* labels, bool* ok); |
| Statement* ParseForStatement(ZoneStringList* labels, bool* ok); |
| Statement* ParseThrowStatement(bool* ok); |
| Expression* MakeCatchContext(Handle<String> id, VariableProxy* value); |
| TryStatement* ParseTryStatement(bool* ok); |
| DebuggerStatement* ParseDebuggerStatement(bool* ok); |
| |
| Expression* ParseExpression(bool accept_IN, bool* ok); |
| Expression* ParseAssignmentExpression(bool accept_IN, bool* ok); |
| Expression* ParseConditionalExpression(bool accept_IN, bool* ok); |
| Expression* ParseBinaryExpression(int prec, bool accept_IN, bool* ok); |
| Expression* ParseUnaryExpression(bool* ok); |
| Expression* ParsePostfixExpression(bool* ok); |
| Expression* ParseLeftHandSideExpression(bool* ok); |
| Expression* ParseNewExpression(bool* ok); |
| Expression* ParseMemberExpression(bool* ok); |
| Expression* ParseNewPrefix(PositionStack* stack, bool* ok); |
| Expression* ParseMemberWithNewPrefixesExpression(PositionStack* stack, |
| bool* ok); |
| Expression* ParsePrimaryExpression(bool* ok); |
| Expression* ParseArrayLiteral(bool* ok); |
| Expression* ParseObjectLiteral(bool* ok); |
| Expression* ParseRegExpLiteral(bool seen_equal, bool* ok); |
| |
| // Decide if a property should be the object boilerplate. |
| bool IsBoilerplateProperty(ObjectLiteral::Property* property); |
| // If the expression is a literal, return the literal value; |
| // if the expression is a materialized literal and is simple return a |
| // compile time value as encoded by CompileTimeValue::GetValue(). |
| // Otherwise, return undefined literal as the placeholder |
| // in the object literal boilerplate. |
| Handle<Object> GetBoilerplateValue(Expression* expression); |
| |
| enum FunctionLiteralType { |
| EXPRESSION, |
| DECLARATION, |
| NESTED |
| }; |
| |
| ZoneList<Expression*>* ParseArguments(bool* ok); |
| FunctionLiteral* ParseFunctionLiteral(Handle<String> var_name, |
| int function_token_position, |
| FunctionLiteralType type, |
| bool* ok); |
| |
| |
| // Magical syntax support. |
| Expression* ParseV8Intrinsic(bool* ok); |
| |
| INLINE(Token::Value peek()) { return scanner_.peek(); } |
| INLINE(Token::Value Next()) { return scanner_.Next(); } |
| INLINE(void Consume(Token::Value token)); |
| void Expect(Token::Value token, bool* ok); |
| void ExpectSemicolon(bool* ok); |
| |
| // Get odd-ball literals. |
| Literal* GetLiteralUndefined(); |
| Literal* GetLiteralTheHole(); |
| Literal* GetLiteralNumber(double value); |
| |
| Handle<String> ParseIdentifier(bool* ok); |
| Handle<String> ParseIdentifierOrGetOrSet(bool* is_get, |
| bool* is_set, |
| bool* ok); |
| |
| // Parser support |
| virtual VariableProxy* Declare(Handle<String> name, Variable::Mode mode, |
| FunctionLiteral* fun, |
| bool resolve, |
| bool* ok) = 0; |
| |
| bool TargetStackContainsLabel(Handle<String> label); |
| BreakableStatement* LookupBreakTarget(Handle<String> label, bool* ok); |
| IterationStatement* LookupContinueTarget(Handle<String> label, bool* ok); |
| |
| void RegisterTargetUse(BreakTarget* target, Target* stop); |
| |
| // Create a number literal. |
| Literal* NewNumberLiteral(double value); |
| |
| // Generate AST node that throw a ReferenceError with the given type. |
| Expression* NewThrowReferenceError(Handle<String> type); |
| |
| // Generate AST node that throw a SyntaxError with the given |
| // type. The first argument may be null (in the handle sense) in |
| // which case no arguments are passed to the constructor. |
| Expression* NewThrowSyntaxError(Handle<String> type, Handle<Object> first); |
| |
| // Generate AST node that throw a TypeError with the given |
| // type. Both arguments must be non-null (in the handle sense). |
| Expression* NewThrowTypeError(Handle<String> type, |
| Handle<Object> first, |
| Handle<Object> second); |
| |
| // Generic AST generator for throwing errors from compiled code. |
| Expression* NewThrowError(Handle<String> constructor, |
| Handle<String> type, |
| Vector< Handle<Object> > arguments); |
| |
| friend class Target; |
| friend class TargetScope; |
| friend class LexicalScope; |
| friend class TemporaryScope; |
| }; |
| |
| |
| template <typename T, int initial_size> |
| class BufferedZoneList { |
| public: |
| |
| BufferedZoneList() : |
| list_(NULL), last_(NULL) {} |
| |
| // Adds element at end of list. This element is buffered and can |
| // be read using last() or removed using RemoveLast until a new Add or until |
| // RemoveLast or GetList has been called. |
| void Add(T* value) { |
| if (last_ != NULL) { |
| if (list_ == NULL) { |
| list_ = new ZoneList<T*>(initial_size); |
| } |
| list_->Add(last_); |
| } |
| last_ = value; |
| } |
| |
| T* last() { |
| ASSERT(last_ != NULL); |
| return last_; |
| } |
| |
| T* RemoveLast() { |
| ASSERT(last_ != NULL); |
| T* result = last_; |
| if (list_ != NULL && list_->length() > 0) |
| last_ = list_->RemoveLast(); |
| else |
| last_ = NULL; |
| return result; |
| } |
| |
| T* Get(int i) { |
| ASSERT(0 <= i && i < length()); |
| if (list_ == NULL) { |
| ASSERT_EQ(0, i); |
| return last_; |
| } else { |
| if (i == list_->length()) { |
| ASSERT(last_ != NULL); |
| return last_; |
| } else { |
| return list_->at(i); |
| } |
| } |
| } |
| |
| void Clear() { |
| list_ = NULL; |
| last_ = NULL; |
| } |
| |
| int length() { |
| int length = (list_ == NULL) ? 0 : list_->length(); |
| return length + ((last_ == NULL) ? 0 : 1); |
| } |
| |
| ZoneList<T*>* GetList() { |
| if (list_ == NULL) { |
| list_ = new ZoneList<T*>(initial_size); |
| } |
| if (last_ != NULL) { |
| list_->Add(last_); |
| last_ = NULL; |
| } |
| return list_; |
| } |
| |
| private: |
| ZoneList<T*>* list_; |
| T* last_; |
| }; |
| |
| // Accumulates RegExp atoms and assertions into lists of terms and alternatives. |
| class RegExpBuilder: public ZoneObject { |
| public: |
| RegExpBuilder(); |
| void AddCharacter(uc16 character); |
| // "Adds" an empty expression. Does nothing except consume a |
| // following quantifier |
| void AddEmpty(); |
| void AddAtom(RegExpTree* tree); |
| void AddAssertion(RegExpTree* tree); |
| void NewAlternative(); // '|' |
| void AddQuantifierToAtom(int min, int max, bool is_greedy); |
| RegExpTree* ToRegExp(); |
| private: |
| void FlushCharacters(); |
| void FlushText(); |
| void FlushTerms(); |
| bool pending_empty_; |
| ZoneList<uc16>* characters_; |
| BufferedZoneList<RegExpTree, 2> terms_; |
| BufferedZoneList<RegExpTree, 2> text_; |
| BufferedZoneList<RegExpTree, 2> alternatives_; |
| #ifdef DEBUG |
| enum {ADD_NONE, ADD_CHAR, ADD_TERM, ADD_ASSERT, ADD_ATOM} last_added_; |
| #define LAST(x) last_added_ = x; |
| #else |
| #define LAST(x) |
| #endif |
| }; |
| |
| |
| RegExpBuilder::RegExpBuilder() |
| : pending_empty_(false), |
| characters_(NULL), |
| terms_(), |
| alternatives_() |
| #ifdef DEBUG |
| , last_added_(ADD_NONE) |
| #endif |
| {} |
| |
| |
| void RegExpBuilder::FlushCharacters() { |
| pending_empty_ = false; |
| if (characters_ != NULL) { |
| RegExpTree* atom = new RegExpAtom(characters_->ToConstVector()); |
| characters_ = NULL; |
| text_.Add(atom); |
| LAST(ADD_ATOM); |
| } |
| } |
| |
| |
| void RegExpBuilder::FlushText() { |
| FlushCharacters(); |
| int num_text = text_.length(); |
| if (num_text == 0) { |
| return; |
| } else if (num_text == 1) { |
| terms_.Add(text_.last()); |
| } else { |
| RegExpText* text = new RegExpText(); |
| for (int i = 0; i < num_text; i++) |
| text_.Get(i)->AppendToText(text); |
| terms_.Add(text); |
| } |
| text_.Clear(); |
| } |
| |
| |
| void RegExpBuilder::AddCharacter(uc16 c) { |
| pending_empty_ = false; |
| if (characters_ == NULL) { |
| characters_ = new ZoneList<uc16>(4); |
| } |
| characters_->Add(c); |
| LAST(ADD_CHAR); |
| } |
| |
| |
| void RegExpBuilder::AddEmpty() { |
| pending_empty_ = true; |
| } |
| |
| |
| void RegExpBuilder::AddAtom(RegExpTree* term) { |
| if (term->IsEmpty()) { |
| AddEmpty(); |
| return; |
| } |
| if (term->IsTextElement()) { |
| FlushCharacters(); |
| text_.Add(term); |
| } else { |
| FlushText(); |
| terms_.Add(term); |
| } |
| LAST(ADD_ATOM); |
| } |
| |
| |
| void RegExpBuilder::AddAssertion(RegExpTree* assert) { |
| FlushText(); |
| terms_.Add(assert); |
| LAST(ADD_ASSERT); |
| } |
| |
| |
| void RegExpBuilder::NewAlternative() { |
| FlushTerms(); |
| } |
| |
| |
| void RegExpBuilder::FlushTerms() { |
| FlushText(); |
| int num_terms = terms_.length(); |
| RegExpTree* alternative; |
| if (num_terms == 0) { |
| alternative = RegExpEmpty::GetInstance(); |
| } else if (num_terms == 1) { |
| alternative = terms_.last(); |
| } else { |
| alternative = new RegExpAlternative(terms_.GetList()); |
| } |
| alternatives_.Add(alternative); |
| terms_.Clear(); |
| LAST(ADD_NONE); |
| } |
| |
| |
| RegExpTree* RegExpBuilder::ToRegExp() { |
| FlushTerms(); |
| int num_alternatives = alternatives_.length(); |
| if (num_alternatives == 0) { |
| return RegExpEmpty::GetInstance(); |
| } |
| if (num_alternatives == 1) { |
| return alternatives_.last(); |
| } |
| return new RegExpDisjunction(alternatives_.GetList()); |
| } |
| |
| |
| void RegExpBuilder::AddQuantifierToAtom(int min, int max, bool is_greedy) { |
| if (pending_empty_) { |
| pending_empty_ = false; |
| return; |
| } |
| RegExpTree* atom; |
| if (characters_ != NULL) { |
| ASSERT(last_added_ == ADD_CHAR); |
| // Last atom was character. |
| Vector<const uc16> char_vector = characters_->ToConstVector(); |
| int num_chars = char_vector.length(); |
| if (num_chars > 1) { |
| Vector<const uc16> prefix = char_vector.SubVector(0, num_chars - 1); |
| text_.Add(new RegExpAtom(prefix)); |
| char_vector = char_vector.SubVector(num_chars - 1, num_chars); |
| } |
| characters_ = NULL; |
| atom = new RegExpAtom(char_vector); |
| FlushText(); |
| } else if (text_.length() > 0) { |
| ASSERT(last_added_ == ADD_ATOM); |
| atom = text_.RemoveLast(); |
| FlushText(); |
| } else if (terms_.length() > 0) { |
| ASSERT(last_added_ == ADD_ATOM); |
| atom = terms_.RemoveLast(); |
| if (atom->max_match() == 0) { |
| // Guaranteed to only match an empty string. |
| LAST(ADD_TERM); |
| if (min == 0) { |
| return; |
| } |
| terms_.Add(atom); |
| return; |
| } |
| } else { |
| // Only call immediately after adding an atom or character! |
| UNREACHABLE(); |
| return; |
| } |
| terms_.Add(new RegExpQuantifier(min, max, is_greedy, atom)); |
| LAST(ADD_TERM); |
| } |
| |
| |
| class RegExpParser { |
| public: |
| RegExpParser(FlatStringReader* in, |
| Handle<String>* error, |
| bool multiline_mode); |
| RegExpTree* ParsePattern(); |
| RegExpTree* ParseDisjunction(); |
| RegExpTree* ParseGroup(); |
| RegExpTree* ParseCharacterClass(); |
| |
| // Parses a {...,...} quantifier and stores the range in the given |
| // out parameters. |
| bool ParseIntervalQuantifier(int* min_out, int* max_out); |
| |
| // Parses and returns a single escaped character. The character |
| // must not be 'b' or 'B' since they are usually handle specially. |
| uc32 ParseClassCharacterEscape(); |
| |
| // Checks whether the following is a length-digit hexadecimal number, |
| // and sets the value if it is. |
| bool ParseHexEscape(int length, uc32* value); |
| |
| uc32 ParseControlLetterEscape(); |
| uc32 ParseOctalLiteral(); |
| |
| // Tries to parse the input as a back reference. If successful it |
| // stores the result in the output parameter and returns true. If |
| // it fails it will push back the characters read so the same characters |
| // can be reparsed. |
| bool ParseBackReferenceIndex(int* index_out); |
| |
| CharacterRange ParseClassAtom(uc16* char_class); |
| RegExpTree* ReportError(Vector<const char> message); |
| void Advance(); |
| void Advance(int dist); |
| void Reset(int pos); |
| |
| // Reports whether the pattern might be used as a literal search string. |
| // Only use if the result of the parse is a single atom node. |
| bool simple(); |
| bool contains_anchor() { return contains_anchor_; } |
| void set_contains_anchor() { contains_anchor_ = true; } |
| int captures_started() { return captures_ == NULL ? 0 : captures_->length(); } |
| int position() { return next_pos_ - 1; } |
| bool failed() { return failed_; } |
| |
| static const int kMaxCaptures = 1 << 16; |
| static const uc32 kEndMarker = (1 << 21); |
| private: |
| enum SubexpressionType { |
| INITIAL, |
| CAPTURE, // All positive values represent captures. |
| POSITIVE_LOOKAHEAD, |
| NEGATIVE_LOOKAHEAD, |
| GROUPING |
| }; |
| |
| class RegExpParserState : public ZoneObject { |
| public: |
| RegExpParserState(RegExpParserState* previous_state, |
| SubexpressionType group_type, |
| int disjunction_capture_index) |
| : previous_state_(previous_state), |
| builder_(new RegExpBuilder()), |
| group_type_(group_type), |
| disjunction_capture_index_(disjunction_capture_index) {} |
| // Parser state of containing expression, if any. |
| RegExpParserState* previous_state() { return previous_state_; } |
| bool IsSubexpression() { return previous_state_ != NULL; } |
| // RegExpBuilder building this regexp's AST. |
| RegExpBuilder* builder() { return builder_; } |
| // Type of regexp being parsed (parenthesized group or entire regexp). |
| SubexpressionType group_type() { return group_type_; } |
| // Index in captures array of first capture in this sub-expression, if any. |
| // Also the capture index of this sub-expression itself, if group_type |
| // is CAPTURE. |
| int capture_index() { return disjunction_capture_index_; } |
| private: |
| // Linked list implementation of stack of states. |
| RegExpParserState* previous_state_; |
| // Builder for the stored disjunction. |
| RegExpBuilder* builder_; |
| // Stored disjunction type (capture, look-ahead or grouping), if any. |
| SubexpressionType group_type_; |
| // Stored disjunction's capture index (if any). |
| int disjunction_capture_index_; |
| }; |
| |
| uc32 current() { return current_; } |
| bool has_more() { return has_more_; } |
| bool has_next() { return next_pos_ < in()->length(); } |
| uc32 Next(); |
| FlatStringReader* in() { return in_; } |
| void ScanForCaptures(); |
| uc32 current_; |
| bool has_more_; |
| bool multiline_; |
| int next_pos_; |
| FlatStringReader* in_; |
| Handle<String>* error_; |
| bool simple_; |
| bool contains_anchor_; |
| ZoneList<RegExpCapture*>* captures_; |
| bool is_scanned_for_captures_; |
| // The capture count is only valid after we have scanned for captures. |
| int capture_count_; |
| bool failed_; |
| }; |
| |
| |
| // A temporary scope stores information during parsing, just like |
| // a plain scope. However, temporary scopes are not kept around |
| // after parsing or referenced by syntax trees so they can be stack- |
| // allocated and hence used by the pre-parser. |
| class TemporaryScope BASE_EMBEDDED { |
| public: |
| explicit TemporaryScope(Parser* parser); |
| ~TemporaryScope(); |
| |
| int NextMaterializedLiteralIndex() { |
| int next_index = |
| materialized_literal_count_ + JSFunction::kLiteralsPrefixSize; |
| materialized_literal_count_++; |
| return next_index; |
| } |
| int materialized_literal_count() { return materialized_literal_count_; } |
| |
| void set_contains_array_literal() { contains_array_literal_ = true; } |
| bool contains_array_literal() { return contains_array_literal_; } |
| |
| void SetThisPropertyAssignmentInfo( |
| bool only_this_property_assignments, |
| bool only_simple_this_property_assignments, |
| Handle<FixedArray> this_property_assignments) { |
| only_this_property_assignments_ = only_this_property_assignments; |
| only_simple_this_property_assignments_ = |
| only_simple_this_property_assignments; |
| this_property_assignments_ = this_property_assignments; |
| } |
| bool only_this_property_assignments() { |
| return only_this_property_assignments_; |
| } |
| bool only_simple_this_property_assignments() { |
| return only_simple_this_property_assignments_; |
| } |
| Handle<FixedArray> this_property_assignments() { |
| return this_property_assignments_; |
| } |
| |
| void AddProperty() { expected_property_count_++; } |
| int expected_property_count() { return expected_property_count_; } |
| private: |
| // Captures the number of nodes that need materialization in the |
| // function. regexp literals, and boilerplate for object literals. |
| int materialized_literal_count_; |
| |
| // Captures whether or not the function contains array literals. If |
| // the function contains array literals, we have to allocate space |
| // for the array constructor in the literals array of the function. |
| // This array constructor is used when creating the actual array |
| // literals. |
| bool contains_array_literal_; |
| |
| // Properties count estimation. |
| int expected_property_count_; |
| |
| bool only_this_property_assignments_; |
| bool only_simple_this_property_assignments_; |
| Handle<FixedArray> this_property_assignments_; |
| |
| // Bookkeeping |
| Parser* parser_; |
| TemporaryScope* parent_; |
| |
| friend class Parser; |
| }; |
| |
| |
| TemporaryScope::TemporaryScope(Parser* parser) |
| : materialized_literal_count_(0), |
| contains_array_literal_(false), |
| expected_property_count_(0), |
| only_this_property_assignments_(false), |
| only_simple_this_property_assignments_(false), |
| this_property_assignments_(Factory::empty_fixed_array()), |
| parser_(parser), |
| parent_(parser->temp_scope_) { |
| parser->temp_scope_ = this; |
| } |
| |
| |
| TemporaryScope::~TemporaryScope() { |
| parser_->temp_scope_ = parent_; |
| } |
| |
| |
| // A zone list wrapper lets code either access a access a zone list |
| // or appear to do so while actually ignoring all operations. |
| template <typename T> |
| class ZoneListWrapper { |
| public: |
| ZoneListWrapper() : list_(NULL) { } |
| explicit ZoneListWrapper(int size) : list_(new ZoneList<T*>(size)) { } |
| void Add(T* that) { if (list_) list_->Add(that); } |
| int length() { return list_->length(); } |
| ZoneList<T*>* elements() { return list_; } |
| T* at(int index) { return list_->at(index); } |
| private: |
| ZoneList<T*>* list_; |
| }; |
| |
| |
| // Allocation macro that should be used to allocate objects that must |
| // only be allocated in real parsing mode. Note that in preparse mode |
| // not only is the syntax tree not created but the constructor |
| // arguments are not evaluated. |
| #define NEW(expr) (is_pre_parsing_ ? NULL : new expr) |
| |
| |
| class ParserFactory BASE_EMBEDDED { |
| public: |
| explicit ParserFactory(bool is_pre_parsing) : |
| is_pre_parsing_(is_pre_parsing) { } |
| |
| virtual ~ParserFactory() { } |
| |
| virtual Scope* NewScope(Scope* parent, Scope::Type type, bool inside_with); |
| |
| virtual Handle<String> LookupSymbol(const char* string, int length) { |
| return Handle<String>(); |
| } |
| |
| virtual Handle<String> EmptySymbol() { |
| return Handle<String>(); |
| } |
| |
| virtual Expression* NewProperty(Expression* obj, Expression* key, int pos) { |
| if (obj == VariableProxySentinel::this_proxy()) { |
| return Property::this_property(); |
| } else { |
| return ValidLeftHandSideSentinel::instance(); |
| } |
| } |
| |
| virtual Expression* NewCall(Expression* expression, |
| ZoneList<Expression*>* arguments, |
| int pos) { |
| return Call::sentinel(); |
| } |
| |
| virtual Statement* EmptyStatement() { |
| return NULL; |
| } |
| |
| template <typename T> ZoneListWrapper<T> NewList(int size) { |
| return is_pre_parsing_ ? ZoneListWrapper<T>() : ZoneListWrapper<T>(size); |
| } |
| |
| private: |
| bool is_pre_parsing_; |
| }; |
| |
| |
| class ParserLog BASE_EMBEDDED { |
| public: |
| virtual ~ParserLog() { } |
| |
| // Records the occurrence of a function. The returned object is |
| // only guaranteed to be valid until the next function has been |
| // logged. |
| virtual FunctionEntry LogFunction(int start) { return FunctionEntry(); } |
| |
| virtual void LogError() { } |
| }; |
| |
| |
| class AstBuildingParserFactory : public ParserFactory { |
| public: |
| AstBuildingParserFactory() : ParserFactory(false) { } |
| |
| virtual Scope* NewScope(Scope* parent, Scope::Type type, bool inside_with); |
| |
| virtual Handle<String> LookupSymbol(const char* string, int length) { |
| return Factory::LookupSymbol(Vector<const char>(string, length)); |
| } |
| |
| virtual Handle<String> EmptySymbol() { |
| return Factory::empty_symbol(); |
| } |
| |
| virtual Expression* NewProperty(Expression* obj, Expression* key, int pos) { |
| return new Property(obj, key, pos); |
| } |
| |
| virtual Expression* NewCall(Expression* expression, |
| ZoneList<Expression*>* arguments, |
| int pos) { |
| return new Call(expression, arguments, pos); |
| } |
| |
| virtual Statement* EmptyStatement(); |
| }; |
| |
| |
| class ParserRecorder: public ParserLog { |
| public: |
| ParserRecorder(); |
| virtual FunctionEntry LogFunction(int start); |
| virtual void LogError() { } |
| virtual void LogMessage(Scanner::Location loc, |
| const char* message, |
| Vector<const char*> args); |
| void WriteString(Vector<const char> str); |
| static const char* ReadString(unsigned* start, int* chars); |
| List<unsigned>* store() { return &store_; } |
| private: |
| bool has_error_; |
| List<unsigned> store_; |
| }; |
| |
| |
| FunctionEntry ScriptDataImpl::GetFunctionEnd(int start) { |
| if (nth(last_entry_).start_pos() > start) { |
| // If the last entry we looked up is higher than what we're |
| // looking for then it's useless and we reset it. |
| last_entry_ = 0; |
| } |
| for (int i = last_entry_; i < EntryCount(); i++) { |
| FunctionEntry entry = nth(i); |
| if (entry.start_pos() == start) { |
| last_entry_ = i; |
| return entry; |
| } |
| } |
| return FunctionEntry(); |
| } |
| |
| |
| bool ScriptDataImpl::SanityCheck() { |
| if (store_.length() < static_cast<int>(ScriptDataImpl::kHeaderSize)) |
| return false; |
| if (magic() != ScriptDataImpl::kMagicNumber) |
| return false; |
| if (version() != ScriptDataImpl::kCurrentVersion) |
| return false; |
| return true; |
| } |
| |
| |
| int ScriptDataImpl::EntryCount() { |
| return (store_.length() - kHeaderSize) / FunctionEntry::kSize; |
| } |
| |
| |
| FunctionEntry ScriptDataImpl::nth(int n) { |
| int offset = kHeaderSize + n * FunctionEntry::kSize; |
| return FunctionEntry(Vector<unsigned>(store_.start() + offset, |
| FunctionEntry::kSize)); |
| } |
| |
| |
| ParserRecorder::ParserRecorder() |
| : has_error_(false), store_(4) { |
| Vector<unsigned> preamble = store()->AddBlock(0, ScriptDataImpl::kHeaderSize); |
| preamble[ScriptDataImpl::kMagicOffset] = ScriptDataImpl::kMagicNumber; |
| preamble[ScriptDataImpl::kVersionOffset] = ScriptDataImpl::kCurrentVersion; |
| preamble[ScriptDataImpl::kHasErrorOffset] = false; |
| } |
| |
| |
| void ParserRecorder::WriteString(Vector<const char> str) { |
| store()->Add(str.length()); |
| for (int i = 0; i < str.length(); i++) |
| store()->Add(str[i]); |
| } |
| |
| |
| const char* ParserRecorder::ReadString(unsigned* start, int* chars) { |
| int length = start[0]; |
| char* result = NewArray<char>(length + 1); |
| for (int i = 0; i < length; i++) |
| result[i] = start[i + 1]; |
| result[length] = '\0'; |
| if (chars != NULL) *chars = length; |
| return result; |
| } |
| |
| |
| void ParserRecorder::LogMessage(Scanner::Location loc, const char* message, |
| Vector<const char*> args) { |
| if (has_error_) return; |
| store()->Rewind(ScriptDataImpl::kHeaderSize); |
| store()->at(ScriptDataImpl::kHasErrorOffset) = true; |
| store()->Add(loc.beg_pos); |
| store()->Add(loc.end_pos); |
| store()->Add(args.length()); |
| WriteString(CStrVector(message)); |
| for (int i = 0; i < args.length(); i++) |
| WriteString(CStrVector(args[i])); |
| } |
| |
| |
| Scanner::Location ScriptDataImpl::MessageLocation() { |
| int beg_pos = Read(0); |
| int end_pos = Read(1); |
| return Scanner::Location(beg_pos, end_pos); |
| } |
| |
| |
| const char* ScriptDataImpl::BuildMessage() { |
| unsigned* start = ReadAddress(3); |
| return ParserRecorder::ReadString(start, NULL); |
| } |
| |
| |
| Vector<const char*> ScriptDataImpl::BuildArgs() { |
| int arg_count = Read(2); |
| const char** array = NewArray<const char*>(arg_count); |
| int pos = ScriptDataImpl::kHeaderSize + Read(3); |
| for (int i = 0; i < arg_count; i++) { |
| int count = 0; |
| array[i] = ParserRecorder::ReadString(ReadAddress(pos), &count); |
| pos += count + 1; |
| } |
| return Vector<const char*>(array, arg_count); |
| } |
| |
| |
| unsigned ScriptDataImpl::Read(int position) { |
| return store_[ScriptDataImpl::kHeaderSize + position]; |
| } |
| |
| |
| unsigned* ScriptDataImpl::ReadAddress(int position) { |
| return &store_[ScriptDataImpl::kHeaderSize + position]; |
| } |
| |
| |
| FunctionEntry ParserRecorder::LogFunction(int start) { |
| if (has_error_) return FunctionEntry(); |
| FunctionEntry result(store()->AddBlock(0, FunctionEntry::kSize)); |
| result.set_start_pos(start); |
| return result; |
| } |
| |
| |
| class AstBuildingParser : public Parser { |
| public: |
| AstBuildingParser(Handle<Script> script, bool allow_natives_syntax, |
| v8::Extension* extension, ScriptDataImpl* pre_data) |
| : Parser(script, allow_natives_syntax, extension, false, |
| factory(), log(), pre_data) { } |
| virtual void ReportMessageAt(Scanner::Location loc, const char* message, |
| Vector<const char*> args); |
| virtual VariableProxy* Declare(Handle<String> name, Variable::Mode mode, |
| FunctionLiteral* fun, bool resolve, bool* ok); |
| AstBuildingParserFactory* factory() { return &factory_; } |
| ParserLog* log() { return &log_; } |
| |
| private: |
| ParserLog log_; |
| AstBuildingParserFactory factory_; |
| }; |
| |
| |
| class PreParser : public Parser { |
| public: |
| PreParser(Handle<Script> script, bool allow_natives_syntax, |
| v8::Extension* extension) |
| : Parser(script, allow_natives_syntax, extension, true, |
| factory(), recorder(), NULL) |
| , factory_(true) { } |
| virtual void ReportMessageAt(Scanner::Location loc, const char* message, |
| Vector<const char*> args); |
| virtual VariableProxy* Declare(Handle<String> name, Variable::Mode mode, |
| FunctionLiteral* fun, bool resolve, bool* ok); |
| ParserFactory* factory() { return &factory_; } |
| ParserRecorder* recorder() { return &recorder_; } |
| |
| private: |
| ParserRecorder recorder_; |
| ParserFactory factory_; |
| }; |
| |
| |
| Scope* AstBuildingParserFactory::NewScope(Scope* parent, Scope::Type type, |
| bool inside_with) { |
| Scope* result = new Scope(parent, type); |
| result->Initialize(inside_with); |
| return result; |
| } |
| |
| |
| Statement* AstBuildingParserFactory::EmptyStatement() { |
| // Use a statically allocated empty statement singleton to avoid |
| // allocating lots and lots of empty statements. |
| static v8::internal::EmptyStatement empty; |
| return ∅ |
| } |
| |
| |
| Scope* ParserFactory::NewScope(Scope* parent, Scope::Type type, |
| bool inside_with) { |
| ASSERT(parent != NULL); |
| parent->type_ = type; |
| return parent; |
| } |
| |
| |
| VariableProxy* PreParser::Declare(Handle<String> name, Variable::Mode mode, |
| FunctionLiteral* fun, bool resolve, |
| bool* ok) { |
| return NULL; |
| } |
| |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Target is a support class to facilitate manipulation of the |
| // Parser's target_stack_ (the stack of potential 'break' and |
| // 'continue' statement targets). Upon construction, a new target is |
| // added; it is removed upon destruction. |
| |
| class Target BASE_EMBEDDED { |
| public: |
| Target(Parser* parser, AstNode* node) |
| : parser_(parser), node_(node), previous_(parser_->target_stack_) { |
| parser_->target_stack_ = this; |
| } |
| |
| ~Target() { |
| parser_->target_stack_ = previous_; |
| } |
| |
| Target* previous() { return previous_; } |
| AstNode* node() { return node_; } |
| |
| private: |
| Parser* parser_; |
| AstNode* node_; |
| Target* previous_; |
| }; |
| |
| |
| class TargetScope BASE_EMBEDDED { |
| public: |
| explicit TargetScope(Parser* parser) |
| : parser_(parser), previous_(parser->target_stack_) { |
| parser->target_stack_ = NULL; |
| } |
| |
| ~TargetScope() { |
| parser_->target_stack_ = previous_; |
| } |
| |
| private: |
| Parser* parser_; |
| Target* previous_; |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // LexicalScope is a support class to facilitate manipulation of the |
| // Parser's scope stack. The constructor sets the parser's top scope |
| // to the incoming scope, and the destructor resets it. |
| |
| class LexicalScope BASE_EMBEDDED { |
| public: |
| LexicalScope(Parser* parser, Scope* scope) |
| : parser_(parser), |
| prev_scope_(parser->top_scope_), |
| prev_level_(parser->with_nesting_level_) { |
| parser_->top_scope_ = scope; |
| parser_->with_nesting_level_ = 0; |
| } |
| |
| ~LexicalScope() { |
| parser_->top_scope_ = prev_scope_; |
| parser_->with_nesting_level_ = prev_level_; |
| } |
| |
| private: |
| Parser* parser_; |
| Scope* prev_scope_; |
| int prev_level_; |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // The CHECK_OK macro is a convenient macro to enforce error |
| // handling for functions that may fail (by returning !*ok). |
| // |
| // CAUTION: This macro appends extra statements after a call, |
| // thus it must never be used where only a single statement |
| // is correct (e.g. an if statement branch w/o braces)! |
| |
| #define CHECK_OK ok); \ |
| if (!*ok) return NULL; \ |
| ((void)0 |
| #define DUMMY ) // to make indentation work |
| #undef DUMMY |
| |
| #define CHECK_FAILED /**/); \ |
| if (failed_) return NULL; \ |
| ((void)0 |
| #define DUMMY ) // to make indentation work |
| #undef DUMMY |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of Parser |
| |
| Parser::Parser(Handle<Script> script, |
| bool allow_natives_syntax, |
| v8::Extension* extension, |
| bool is_pre_parsing, |
| ParserFactory* factory, |
| ParserLog* log, |
| ScriptDataImpl* pre_data) |
| : script_(script), |
| scanner_(is_pre_parsing), |
| top_scope_(NULL), |
| with_nesting_level_(0), |
| temp_scope_(NULL), |
| target_stack_(NULL), |
| allow_natives_syntax_(allow_natives_syntax), |
| extension_(extension), |
| factory_(factory), |
| log_(log), |
| is_pre_parsing_(is_pre_parsing), |
| pre_data_(pre_data) { |
| } |
| |
| |
| bool Parser::PreParseProgram(Handle<String> source, |
| unibrow::CharacterStream* stream) { |
| HistogramTimerScope timer(&Counters::pre_parse); |
| AssertNoZoneAllocation assert_no_zone_allocation; |
| AssertNoAllocation assert_no_allocation; |
| NoHandleAllocation no_handle_allocation; |
| scanner_.Init(source, stream, 0); |
| ASSERT(target_stack_ == NULL); |
| mode_ = PARSE_EAGERLY; |
| DummyScope top_scope; |
| LexicalScope scope(this, &top_scope); |
| TemporaryScope temp_scope(this); |
| ZoneListWrapper<Statement> processor; |
| bool ok = true; |
| ParseSourceElements(&processor, Token::EOS, &ok); |
| return !scanner().stack_overflow(); |
| } |
| |
| |
| FunctionLiteral* Parser::ParseProgram(Handle<String> source, |
| unibrow::CharacterStream* stream, |
| bool in_global_context) { |
| CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT); |
| |
| HistogramTimerScope timer(&Counters::parse); |
| Counters::total_parse_size.Increment(source->length()); |
| |
| // Initialize parser state. |
| source->TryFlattenIfNotFlat(); |
| scanner_.Init(source, stream, 0); |
| ASSERT(target_stack_ == NULL); |
| |
| // Compute the parsing mode. |
| mode_ = FLAG_lazy ? PARSE_LAZILY : PARSE_EAGERLY; |
| if (allow_natives_syntax_ || extension_ != NULL) mode_ = PARSE_EAGERLY; |
| |
| Scope::Type type = |
| in_global_context |
| ? Scope::GLOBAL_SCOPE |
| : Scope::EVAL_SCOPE; |
| Handle<String> no_name = factory()->EmptySymbol(); |
| |
| FunctionLiteral* result = NULL; |
| { Scope* scope = factory()->NewScope(top_scope_, type, inside_with()); |
| LexicalScope lexical_scope(this, scope); |
| TemporaryScope temp_scope(this); |
| ZoneListWrapper<Statement> body(16); |
| bool ok = true; |
| ParseSourceElements(&body, Token::EOS, &ok); |
| if (ok) { |
| result = NEW(FunctionLiteral( |
| no_name, |
| top_scope_, |
| body.elements(), |
| temp_scope.materialized_literal_count(), |
| temp_scope.contains_array_literal(), |
| temp_scope.expected_property_count(), |
| temp_scope.only_this_property_assignments(), |
| temp_scope.only_simple_this_property_assignments(), |
| temp_scope.this_property_assignments(), |
| 0, |
| 0, |
| source->length(), |
| false)); |
| } else if (scanner().stack_overflow()) { |
| Top::StackOverflow(); |
| } |
| } |
| |
| // Make sure the target stack is empty. |
| ASSERT(target_stack_ == NULL); |
| |
| // If there was a syntax error we have to get rid of the AST |
| // and it is not safe to do so before the scope has been deleted. |
| if (result == NULL) zone_scope.DeleteOnExit(); |
| return result; |
| } |
| |
| |
| FunctionLiteral* Parser::ParseLazy(Handle<String> source, |
| Handle<String> name, |
| int start_position, |
| bool is_expression) { |
| CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT); |
| HistogramTimerScope timer(&Counters::parse_lazy); |
| source->TryFlattenIfNotFlat(); |
| Counters::total_parse_size.Increment(source->length()); |
| SafeStringInputBuffer buffer(source.location()); |
| |
| // Initialize parser state. |
| scanner_.Init(source, &buffer, start_position); |
| ASSERT(target_stack_ == NULL); |
| mode_ = PARSE_EAGERLY; |
| |
| // Place holder for the result. |
| FunctionLiteral* result = NULL; |
| |
| { |
| // Parse the function literal. |
| Handle<String> no_name = factory()->EmptySymbol(); |
| Scope* scope = |
| factory()->NewScope(top_scope_, Scope::GLOBAL_SCOPE, inside_with()); |
| LexicalScope lexical_scope(this, scope); |
| TemporaryScope temp_scope(this); |
| |
| FunctionLiteralType type = is_expression ? EXPRESSION : DECLARATION; |
| bool ok = true; |
| result = ParseFunctionLiteral(name, RelocInfo::kNoPosition, type, &ok); |
| // Make sure the results agree. |
| ASSERT(ok == (result != NULL)); |
| // The only errors should be stack overflows. |
| ASSERT(ok || scanner_.stack_overflow()); |
| } |
| |
| // Make sure the target stack is empty. |
| ASSERT(target_stack_ == NULL); |
| |
| // If there was a stack overflow we have to get rid of AST and it is |
| // not safe to do before scope has been deleted. |
| if (result == NULL) { |
| Top::StackOverflow(); |
| zone_scope.DeleteOnExit(); |
| } |
| return result; |
| } |
| |
| |
| void Parser::ReportMessage(const char* type, Vector<const char*> args) { |
| Scanner::Location source_location = scanner_.location(); |
| ReportMessageAt(source_location, type, args); |
| } |
| |
| |
| void AstBuildingParser::ReportMessageAt(Scanner::Location source_location, |
| const char* type, |
| Vector<const char*> args) { |
| MessageLocation location(script_, |
| source_location.beg_pos, source_location.end_pos); |
| Handle<JSArray> array = Factory::NewJSArray(args.length()); |
| for (int i = 0; i < args.length(); i++) { |
| SetElement(array, i, Factory::NewStringFromUtf8(CStrVector(args[i]))); |
| } |
| Handle<Object> result = Factory::NewSyntaxError(type, array); |
| Top::Throw(*result, &location); |
| } |
| |
| |
| void PreParser::ReportMessageAt(Scanner::Location source_location, |
| const char* type, |
| Vector<const char*> args) { |
| recorder()->LogMessage(source_location, type, args); |
| } |
| |
| |
| // Base class containing common code for the different finder classes used by |
| // the parser. |
| class ParserFinder { |
| protected: |
| ParserFinder() {} |
| static Assignment* AsAssignment(Statement* stat) { |
| if (stat == NULL) return NULL; |
| ExpressionStatement* exp_stat = stat->AsExpressionStatement(); |
| if (exp_stat == NULL) return NULL; |
| return exp_stat->expression()->AsAssignment(); |
| } |
| }; |
| |
| |
| // An InitializationBlockFinder finds and marks sequences of statements of the |
| // form x.y.z.a = ...; x.y.z.b = ...; etc. |
| class InitializationBlockFinder : public ParserFinder { |
| public: |
| InitializationBlockFinder() |
| : first_in_block_(NULL), last_in_block_(NULL), block_size_(0) {} |
| |
| ~InitializationBlockFinder() { |
| if (InBlock()) EndBlock(); |
| } |
| |
| void Update(Statement* stat) { |
| Assignment* assignment = AsAssignment(stat); |
| if (InBlock()) { |
| if (BlockContinues(assignment)) { |
| UpdateBlock(assignment); |
| } else { |
| EndBlock(); |
| } |
| } |
| if (!InBlock() && (assignment != NULL) && |
| (assignment->op() == Token::ASSIGN)) { |
| StartBlock(assignment); |
| } |
| } |
| |
| private: |
| // Returns true if the expressions appear to denote the same object. |
| // In the context of initialization blocks, we only consider expressions |
| // of the form 'x.y.z'. |
| static bool SameObject(Expression* e1, Expression* e2) { |
| VariableProxy* v1 = e1->AsVariableProxy(); |
| VariableProxy* v2 = e2->AsVariableProxy(); |
| if (v1 != NULL && v2 != NULL) { |
| return v1->name()->Equals(*v2->name()); |
| } |
| Property* p1 = e1->AsProperty(); |
| Property* p2 = e2->AsProperty(); |
| if ((p1 == NULL) || (p2 == NULL)) return false; |
| Literal* key1 = p1->key()->AsLiteral(); |
| Literal* key2 = p2->key()->AsLiteral(); |
| if ((key1 == NULL) || (key2 == NULL)) return false; |
| if (!key1->handle()->IsString() || !key2->handle()->IsString()) { |
| return false; |
| } |
| String* name1 = String::cast(*key1->handle()); |
| String* name2 = String::cast(*key2->handle()); |
| if (!name1->Equals(name2)) return false; |
| return SameObject(p1->obj(), p2->obj()); |
| } |
| |
| // Returns true if the expressions appear to denote different properties |
| // of the same object. |
| static bool PropertyOfSameObject(Expression* e1, Expression* e2) { |
| Property* p1 = e1->AsProperty(); |
| Property* p2 = e2->AsProperty(); |
| if ((p1 == NULL) || (p2 == NULL)) return false; |
| return SameObject(p1->obj(), p2->obj()); |
| } |
| |
| bool BlockContinues(Assignment* assignment) { |
| if ((assignment == NULL) || (first_in_block_ == NULL)) return false; |
| if (assignment->op() != Token::ASSIGN) return false; |
| return PropertyOfSameObject(first_in_block_->target(), |
| assignment->target()); |
| } |
| |
| void StartBlock(Assignment* assignment) { |
| first_in_block_ = assignment; |
| last_in_block_ = assignment; |
| block_size_ = 1; |
| } |
| |
| void UpdateBlock(Assignment* assignment) { |
| last_in_block_ = assignment; |
| ++block_size_; |
| } |
| |
| void EndBlock() { |
| if (block_size_ >= Parser::kMinInitializationBlock) { |
| first_in_block_->mark_block_start(); |
| last_in_block_->mark_block_end(); |
| } |
| last_in_block_ = first_in_block_ = NULL; |
| block_size_ = 0; |
| } |
| |
| bool InBlock() { return first_in_block_ != NULL; } |
| |
| Assignment* first_in_block_; |
| Assignment* last_in_block_; |
| int block_size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(InitializationBlockFinder); |
| }; |
| |
| |
| // A ThisNamedPropertyAssigmentFinder finds and marks statements of the form |
| // this.x = ...;, where x is a named property. It also determines whether a |
| // function contains only assignments of this type. |
| class ThisNamedPropertyAssigmentFinder : public ParserFinder { |
| public: |
| ThisNamedPropertyAssigmentFinder() |
| : only_this_property_assignments_(true), |
| only_simple_this_property_assignments_(true), |
| names_(NULL), |
| assigned_arguments_(NULL), |
| assigned_constants_(NULL) {} |
| |
| void Update(Scope* scope, Statement* stat) { |
| // Bail out if function already has non this property assignment |
| // statements. |
| if (!only_this_property_assignments_) { |
| return; |
| } |
| |
| // Check whether this statement is of the form this.x = ...; |
| Assignment* assignment = AsAssignment(stat); |
| if (IsThisPropertyAssignment(assignment)) { |
| HandleThisPropertyAssignment(scope, assignment); |
| } else { |
| only_this_property_assignments_ = false; |
| only_simple_this_property_assignments_ = false; |
| } |
| } |
| |
| // Returns whether only statements of the form this.x = ...; was encountered. |
| bool only_this_property_assignments() { |
| return only_this_property_assignments_; |
| } |
| |
| // Returns whether only statements of the form this.x = y; where y is either a |
| // constant or a function argument was encountered. |
| bool only_simple_this_property_assignments() { |
| return only_simple_this_property_assignments_; |
| } |
| |
| // Returns a fixed array containing three elements for each assignment of the |
| // form this.x = y; |
| Handle<FixedArray> GetThisPropertyAssignments() { |
| if (names_ == NULL) { |
| return Factory::empty_fixed_array(); |
| } |
| ASSERT(names_ != NULL); |
| ASSERT(assigned_arguments_ != NULL); |
| ASSERT_EQ(names_->length(), assigned_arguments_->length()); |
| ASSERT_EQ(names_->length(), assigned_constants_->length()); |
| Handle<FixedArray> assignments = |
| Factory::NewFixedArray(names_->length() * 3); |
| for (int i = 0; i < names_->length(); i++) { |
| assignments->set(i * 3, *names_->at(i)); |
| assignments->set(i * 3 + 1, Smi::FromInt(assigned_arguments_->at(i))); |
| assignments->set(i * 3 + 2, *assigned_constants_->at(i)); |
| } |
| return assignments; |
| } |
| |
| private: |
| bool IsThisPropertyAssignment(Assignment* assignment) { |
| if (assignment != NULL) { |
| Property* property = assignment->target()->AsProperty(); |
| return assignment->op() == Token::ASSIGN |
| && property != NULL |
| && property->obj()->AsVariableProxy() != NULL |
| && property->obj()->AsVariableProxy()->is_this(); |
| } |
| return false; |
| } |
| |
| void HandleThisPropertyAssignment(Scope* scope, Assignment* assignment) { |
| // Check that the property assigned to is a named property. |
| Property* property = assignment->target()->AsProperty(); |
| ASSERT(property != NULL); |
| Literal* literal = property->key()->AsLiteral(); |
| uint32_t dummy; |
| if (literal != NULL && |
| literal->handle()->IsString() && |
| !String::cast(*(literal->handle()))->AsArrayIndex(&dummy)) { |
| Handle<String> key = Handle<String>::cast(literal->handle()); |
| |
| // Check whether the value assigned is either a constant or matches the |
| // name of one of the arguments to the function. |
| if (assignment->value()->AsLiteral() != NULL) { |
| // Constant assigned. |
| Literal* literal = assignment->value()->AsLiteral(); |
| AssignmentFromConstant(key, literal->handle()); |
| } else if (assignment->value()->AsVariableProxy() != NULL) { |
| // Variable assigned. |
| Handle<String> name = |
| assignment->value()->AsVariableProxy()->name(); |
| // Check whether the variable assigned matches an argument name. |
| int index = -1; |
| for (int i = 0; i < scope->num_parameters(); i++) { |
| if (*scope->parameter(i)->name() == *name) { |
| // Assigned from function argument. |
| index = i; |
| break; |
| } |
| } |
| if (index != -1) { |
| AssignmentFromParameter(key, index); |
| } else { |
| AssignmentFromSomethingElse(key); |
| } |
| } else { |
| AssignmentFromSomethingElse(key); |
| } |
| } |
| } |
| |
| void AssignmentFromParameter(Handle<String> name, int index) { |
| EnsureAllocation(); |
| names_->Add(name); |
| assigned_arguments_->Add(index); |
| assigned_constants_->Add(Factory::undefined_value()); |
| } |
| |
| void AssignmentFromConstant(Handle<String> name, Handle<Object> value) { |
| EnsureAllocation(); |
| names_->Add(name); |
| assigned_arguments_->Add(-1); |
| assigned_constants_->Add(value); |
| } |
| |
| void AssignmentFromSomethingElse(Handle<String> name) { |
| EnsureAllocation(); |
| names_->Add(name); |
| assigned_arguments_->Add(-1); |
| assigned_constants_->Add(Factory::undefined_value()); |
| |
| // The this assignment is not a simple one. |
| only_simple_this_property_assignments_ = false; |
| } |
| |
| void EnsureAllocation() { |
| if (names_ == NULL) { |
| ASSERT(assigned_arguments_ == NULL); |
| ASSERT(assigned_constants_ == NULL); |
| names_ = new ZoneStringList(4); |
| assigned_arguments_ = new ZoneList<int>(4); |
| assigned_constants_ = new ZoneObjectList(4); |
| } |
| } |
| |
| bool only_this_property_assignments_; |
| bool only_simple_this_property_assignments_; |
| ZoneStringList* names_; |
| ZoneList<int>* assigned_arguments_; |
| ZoneObjectList* assigned_constants_; |
| }; |
| |
| |
| void* Parser::ParseSourceElements(ZoneListWrapper<Statement>* processor, |
| int end_token, |
| bool* ok) { |
| // SourceElements :: |
| // (Statement)* <end_token> |
| |
| // Allocate a target stack to use for this set of source |
| // elements. This way, all scripts and functions get their own |
| // target stack thus avoiding illegal breaks and continues across |
| // functions. |
| TargetScope scope(this); |
| |
| ASSERT(processor != NULL); |
| InitializationBlockFinder block_finder; |
| ThisNamedPropertyAssigmentFinder this_property_assignment_finder; |
| while (peek() != end_token) { |
| Statement* stat = ParseStatement(NULL, CHECK_OK); |
| if (stat == NULL || stat->IsEmpty()) continue; |
| // We find and mark the initialization blocks on top level code only. |
| // This is because the optimization prevents reuse of the map transitions, |
| // so it should be used only for code that will only be run once. |
| if (top_scope_->is_global_scope()) { |
| block_finder.Update(stat); |
| } |
| // Find and mark all assignments to named properties in this (this.x =) |
| if (top_scope_->is_function_scope()) { |
| this_property_assignment_finder.Update(top_scope_, stat); |
| } |
| processor->Add(stat); |
| } |
| |
| // Propagate the collected information on this property assignments. |
| if (top_scope_->is_function_scope()) { |
| if (this_property_assignment_finder.only_this_property_assignments()) { |
| temp_scope_->SetThisPropertyAssignmentInfo( |
| this_property_assignment_finder.only_this_property_assignments(), |
| this_property_assignment_finder. |
| only_simple_this_property_assignments(), |
| this_property_assignment_finder.GetThisPropertyAssignments()); |
| } |
| } |
| return 0; |
| } |
| |
| |
| Statement* Parser::ParseStatement(ZoneStringList* labels, bool* ok) { |
| // Statement :: |
| // Block |
| // VariableStatement |
| // EmptyStatement |
| // ExpressionStatement |
| // IfStatement |
| // IterationStatement |
| // ContinueStatement |
| // BreakStatement |
| // ReturnStatement |
| // WithStatement |
| // LabelledStatement |
| // SwitchStatement |
| // ThrowStatement |
| // TryStatement |
| // DebuggerStatement |
| |
| // Note: Since labels can only be used by 'break' and 'continue' |
| // statements, which themselves are only valid within blocks, |
| // iterations or 'switch' statements (i.e., BreakableStatements), |
| // labels can be simply ignored in all other cases; except for |
| // trivial labeled break statements 'label: break label' which is |
| // parsed into an empty statement. |
| |
| // Keep the source position of the statement |
| int statement_pos = scanner().peek_location().beg_pos; |
| Statement* stmt = NULL; |
| switch (peek()) { |
| case Token::LBRACE: |
| return ParseBlock(labels, ok); |
| |
| case Token::CONST: // fall through |
| case Token::VAR: |
| stmt = ParseVariableStatement(ok); |
| break; |
| |
| case Token::SEMICOLON: |
| Next(); |
| return factory()->EmptyStatement(); |
| |
| case Token::IF: |
| stmt = ParseIfStatement(labels, ok); |
| break; |
| |
| case Token::DO: |
| stmt = ParseDoStatement(labels, ok); |
| break; |
| |
| case Token::WHILE: |
| stmt = ParseWhileStatement(labels, ok); |
| break; |
| |
| case Token::FOR: |
| stmt = ParseForStatement(labels, ok); |
| break; |
| |
| case Token::CONTINUE: |
| stmt = ParseContinueStatement(ok); |
| break; |
| |
| case Token::BREAK: |
| stmt = ParseBreakStatement(labels, ok); |
| break; |
| |
| case Token::RETURN: |
| stmt = ParseReturnStatement(ok); |
| break; |
| |
| case Token::WITH: |
| stmt = ParseWithStatement(labels, ok); |
| break; |
| |
| case Token::SWITCH: |
| stmt = ParseSwitchStatement(labels, ok); |
| break; |
| |
| case Token::THROW: |
| stmt = ParseThrowStatement(ok); |
| break; |
| |
| case Token::TRY: { |
| // NOTE: It is somewhat complicated to have labels on |
| // try-statements. When breaking out of a try-finally statement, |
| // one must take great care not to treat it as a |
| // fall-through. It is much easier just to wrap the entire |
| // try-statement in a statement block and put the labels there |
| Block* result = NEW(Block(labels, 1, false)); |
| Target target(this, result); |
| TryStatement* statement = ParseTryStatement(CHECK_OK); |
| if (statement) { |
| statement->set_statement_pos(statement_pos); |
| } |
| if (result) result->AddStatement(statement); |
| return result; |
| } |
| |
| case Token::FUNCTION: |
| return ParseFunctionDeclaration(ok); |
| |
| case Token::NATIVE: |
| return ParseNativeDeclaration(ok); |
| |
| case Token::DEBUGGER: |
| stmt = ParseDebuggerStatement(ok); |
| break; |
| |
| default: |
| stmt = ParseExpressionOrLabelledStatement(labels, ok); |
| } |
| |
| // Store the source position of the statement |
| if (stmt != NULL) stmt->set_statement_pos(statement_pos); |
| return stmt; |
| } |
| |
| |
| VariableProxy* AstBuildingParser::Declare(Handle<String> name, |
| Variable::Mode mode, |
| FunctionLiteral* fun, |
| bool resolve, |
| bool* ok) { |
| Variable* var = NULL; |
| // If we are inside a function, a declaration of a variable |
| // is a truly local variable, and the scope of the variable |
| // is always the function scope. |
| |
| // If a function scope exists, then we can statically declare this |
| // variable and also set its mode. In any case, a Declaration node |
| // will be added to the scope so that the declaration can be added |
| // to the corresponding activation frame at runtime if necessary. |
| // For instance declarations inside an eval scope need to be added |
| // to the calling function context. |
| if (top_scope_->is_function_scope()) { |
| // Declare the variable in the function scope. |
| var = top_scope_->LocalLookup(name); |
| if (var == NULL) { |
| // Declare the name. |
| var = top_scope_->DeclareLocal(name, mode); |
| } else { |
| // The name was declared before; check for conflicting |
| // re-declarations. If the previous declaration was a const or the |
| // current declaration is a const then we have a conflict. There is |
| // similar code in runtime.cc in the Declare functions. |
| if ((mode == Variable::CONST) || (var->mode() == Variable::CONST)) { |
| // We only have vars and consts in declarations. |
| ASSERT(var->mode() == Variable::VAR || |
| var->mode() == Variable::CONST); |
| const char* type = (var->mode() == Variable::VAR) ? "var" : "const"; |
| Handle<String> type_string = |
| Factory::NewStringFromUtf8(CStrVector(type), TENURED); |
| Expression* expression = |
| NewThrowTypeError(Factory::redeclaration_symbol(), |
| type_string, name); |
| top_scope_->SetIllegalRedeclaration(expression); |
| } |
| } |
| } |
| |
| // We add a declaration node for every declaration. The compiler |
| // will only generate code if necessary. In particular, declarations |
| // for inner local variables that do not represent functions won't |
| // result in any generated code. |
| // |
| // Note that we always add an unresolved proxy even if it's not |
| // used, simply because we don't know in this method (w/o extra |
| // parameters) if the proxy is needed or not. The proxy will be |
| // bound during variable resolution time unless it was pre-bound |
| // below. |
| // |
| // WARNING: This will lead to multiple declaration nodes for the |
| // same variable if it is declared several times. This is not a |
| // semantic issue as long as we keep the source order, but it may be |
| // a performance issue since it may lead to repeated |
| // Runtime::DeclareContextSlot() calls. |
| VariableProxy* proxy = top_scope_->NewUnresolved(name, inside_with()); |
| top_scope_->AddDeclaration(NEW(Declaration(proxy, mode, fun))); |
| |
| // For global const variables we bind the proxy to a variable. |
| if (mode == Variable::CONST && top_scope_->is_global_scope()) { |
| ASSERT(resolve); // should be set by all callers |
| Variable::Kind kind = Variable::NORMAL; |
| var = NEW(Variable(top_scope_, name, Variable::CONST, true, kind)); |
| } |
| |
| // If requested and we have a local variable, bind the proxy to the variable |
| // at parse-time. This is used for functions (and consts) declared inside |
| // statements: the corresponding function (or const) variable must be in the |
| // function scope and not a statement-local scope, e.g. as provided with a |
| // 'with' statement: |
| // |
| // with (obj) { |
| // function f() {} |
| // } |
| // |
| // which is translated into: |
| // |
| // with (obj) { |
| // // in this case this is not: 'var f; f = function () {};' |
| // var f = function () {}; |
| // } |
| // |
| // Note that if 'f' is accessed from inside the 'with' statement, it |
| // will be allocated in the context (because we must be able to look |
| // it up dynamically) but it will also be accessed statically, i.e., |
| // with a context slot index and a context chain length for this |
| // initialization code. Thus, inside the 'with' statement, we need |
| // both access to the static and the dynamic context chain; the |
| // runtime needs to provide both. |
| if (resolve && var != NULL) proxy->BindTo(var); |
| |
| return proxy; |
| } |
| |
| |
| // Language extension which is only enabled for source files loaded |
| // through the API's extension mechanism. A native function |
| // declaration is resolved by looking up the function through a |
| // callback provided by the extension. |
| Statement* Parser::ParseNativeDeclaration(bool* ok) { |
| if (extension_ == NULL) { |
| ReportUnexpectedToken(Token::NATIVE); |
| *ok = false; |
| return NULL; |
| } |
| |
| Expect(Token::NATIVE, CHECK_OK); |
| Expect(Token::FUNCTION, CHECK_OK); |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| bool done = (peek() == Token::RPAREN); |
| while (!done) { |
| ParseIdentifier(CHECK_OK); |
| done = (peek() == Token::RPAREN); |
| if (!done) Expect(Token::COMMA, CHECK_OK); |
| } |
| Expect(Token::RPAREN, CHECK_OK); |
| Expect(Token::SEMICOLON, CHECK_OK); |
| |
| if (is_pre_parsing_) return NULL; |
| |
| // Make sure that the function containing the native declaration |
| // isn't lazily compiled. The extension structures are only |
| // accessible while parsing the first time not when reparsing |
| // because of lazy compilation. |
| top_scope_->ForceEagerCompilation(); |
| |
| // Compute the function template for the native function. |
| v8::Handle<v8::FunctionTemplate> fun_template = |
| extension_->GetNativeFunction(v8::Utils::ToLocal(name)); |
| ASSERT(!fun_template.IsEmpty()); |
| |
| // Instantiate the function and create a boilerplate function from it. |
| Handle<JSFunction> fun = Utils::OpenHandle(*fun_template->GetFunction()); |
| const int literals = fun->NumberOfLiterals(); |
| Handle<Code> code = Handle<Code>(fun->shared()->code()); |
| Handle<JSFunction> boilerplate = |
| Factory::NewFunctionBoilerplate(name, literals, false, code); |
| |
| // Copy the function data to the boilerplate. Used by |
| // builtins.cc:HandleApiCall to perform argument type checks and to |
| // find the right native code to call. |
| boilerplate->shared()->set_function_data(fun->shared()->function_data()); |
| int parameters = fun->shared()->formal_parameter_count(); |
| boilerplate->shared()->set_formal_parameter_count(parameters); |
| |
| // TODO(1240846): It's weird that native function declarations are |
| // introduced dynamically when we meet their declarations, whereas |
| // other functions are setup when entering the surrounding scope. |
| FunctionBoilerplateLiteral* lit = |
| NEW(FunctionBoilerplateLiteral(boilerplate)); |
| VariableProxy* var = Declare(name, Variable::VAR, NULL, true, CHECK_OK); |
| return NEW(ExpressionStatement( |
| new Assignment(Token::INIT_VAR, var, lit, RelocInfo::kNoPosition))); |
| } |
| |
| |
| Statement* Parser::ParseFunctionDeclaration(bool* ok) { |
| // FunctionDeclaration :: |
| // 'function' Identifier '(' FormalParameterListopt ')' '{' FunctionBody '}' |
| Expect(Token::FUNCTION, CHECK_OK); |
| int function_token_position = scanner().location().beg_pos; |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| FunctionLiteral* fun = ParseFunctionLiteral(name, |
| function_token_position, |
| DECLARATION, |
| CHECK_OK); |
| // Even if we're not at the top-level of the global or a function |
| // scope, we treat is as such and introduce the function with it's |
| // initial value upon entering the corresponding scope. |
| Declare(name, Variable::VAR, fun, true, CHECK_OK); |
| return factory()->EmptyStatement(); |
| } |
| |
| |
| Block* Parser::ParseBlock(ZoneStringList* labels, bool* ok) { |
| // Block :: |
| // '{' Statement* '}' |
| |
| // Note that a Block does not introduce a new execution scope! |
| // (ECMA-262, 3rd, 12.2) |
| // |
| // Construct block expecting 16 statements. |
| Block* result = NEW(Block(labels, 16, false)); |
| Target target(this, result); |
| Expect(Token::LBRACE, CHECK_OK); |
| while (peek() != Token::RBRACE) { |
| Statement* stat = ParseStatement(NULL, CHECK_OK); |
| if (stat && !stat->IsEmpty()) result->AddStatement(stat); |
| } |
| Expect(Token::RBRACE, CHECK_OK); |
| return result; |
| } |
| |
| |
| Block* Parser::ParseVariableStatement(bool* ok) { |
| // VariableStatement :: |
| // VariableDeclarations ';' |
| |
| Expression* dummy; // to satisfy the ParseVariableDeclarations() signature |
| Block* result = ParseVariableDeclarations(true, &dummy, CHECK_OK); |
| ExpectSemicolon(CHECK_OK); |
| return result; |
| } |
| |
| |
| // If the variable declaration declares exactly one non-const |
| // variable, then *var is set to that variable. In all other cases, |
| // *var is untouched; in particular, it is the caller's responsibility |
| // to initialize it properly. This mechanism is used for the parsing |
| // of 'for-in' loops. |
| Block* Parser::ParseVariableDeclarations(bool accept_IN, |
| Expression** var, |
| bool* ok) { |
| // VariableDeclarations :: |
| // ('var' | 'const') (Identifier ('=' AssignmentExpression)?)+[','] |
| |
| Variable::Mode mode = Variable::VAR; |
| bool is_const = false; |
| if (peek() == Token::VAR) { |
| Consume(Token::VAR); |
| } else if (peek() == Token::CONST) { |
| Consume(Token::CONST); |
| mode = Variable::CONST; |
| is_const = true; |
| } else { |
| UNREACHABLE(); // by current callers |
| } |
| |
| // The scope of a variable/const declared anywhere inside a function |
| // is the entire function (ECMA-262, 3rd, 10.1.3, and 12.2). Thus we can |
| // transform a source-level variable/const declaration into a (Function) |
| // Scope declaration, and rewrite the source-level initialization into an |
| // assignment statement. We use a block to collect multiple assignments. |
| // |
| // We mark the block as initializer block because we don't want the |
| // rewriter to add a '.result' assignment to such a block (to get compliant |
| // behavior for code such as print(eval('var x = 7')), and for cosmetic |
| // reasons when pretty-printing. Also, unless an assignment (initialization) |
| // is inside an initializer block, it is ignored. |
| // |
| // Create new block with one expected declaration. |
| Block* block = NEW(Block(NULL, 1, true)); |
| VariableProxy* last_var = NULL; // the last variable declared |
| int nvars = 0; // the number of variables declared |
| do { |
| // Parse variable name. |
| if (nvars > 0) Consume(Token::COMMA); |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| |
| // Declare variable. |
| // Note that we *always* must treat the initial value via a separate init |
| // assignment for variables and constants because the value must be assigned |
| // when the variable is encountered in the source. But the variable/constant |
| // is declared (and set to 'undefined') upon entering the function within |
| // which the variable or constant is declared. Only function variables have |
| // an initial value in the declaration (because they are initialized upon |
| // entering the function). |
| // |
| // If we have a const declaration, in an inner scope, the proxy is always |
| // bound to the declared variable (independent of possibly surrounding with |
| // statements). |
| last_var = Declare(name, mode, NULL, |
| is_const /* always bound for CONST! */, |
| CHECK_OK); |
| nvars++; |
| |
| // Parse initialization expression if present and/or needed. A |
| // declaration of the form: |
| // |
| // var v = x; |
| // |
| // is syntactic sugar for: |
| // |
| // var v; v = x; |
| // |
| // In particular, we need to re-lookup 'v' as it may be a |
| // different 'v' than the 'v' in the declaration (if we are inside |
| // a 'with' statement that makes a object property with name 'v' |
| // visible). |
| // |
| // However, note that const declarations are different! A const |
| // declaration of the form: |
| // |
| // const c = x; |
| // |
| // is *not* syntactic sugar for: |
| // |
| // const c; c = x; |
| // |
| // The "variable" c initialized to x is the same as the declared |
| // one - there is no re-lookup (see the last parameter of the |
| // Declare() call above). |
| |
| Expression* value = NULL; |
| int position = -1; |
| if (peek() == Token::ASSIGN) { |
| Expect(Token::ASSIGN, CHECK_OK); |
| position = scanner().location().beg_pos; |
| value = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| } |
| |
| // Make sure that 'const c' actually initializes 'c' to undefined |
| // even though it seems like a stupid thing to do. |
| if (value == NULL && is_const) { |
| value = GetLiteralUndefined(); |
| } |
| |
| // Global variable declarations must be compiled in a specific |
| // way. When the script containing the global variable declaration |
| // is entered, the global variable must be declared, so that if it |
| // doesn't exist (not even in a prototype of the global object) it |
| // gets created with an initial undefined value. This is handled |
| // by the declarations part of the function representing the |
| // top-level global code; see Runtime::DeclareGlobalVariable. If |
| // it already exists (in the object or in a prototype), it is |
| // *not* touched until the variable declaration statement is |
| // executed. |
| // |
| // Executing the variable declaration statement will always |
| // guarantee to give the global object a "local" variable; a |
| // variable defined in the global object and not in any |
| // prototype. This way, global variable declarations can shadow |
| // properties in the prototype chain, but only after the variable |
| // declaration statement has been executed. This is important in |
| // browsers where the global object (window) has lots of |
| // properties defined in prototype objects. |
| |
| if (!is_pre_parsing_ && top_scope_->is_global_scope()) { |
| // Compute the arguments for the runtime call. |
| ZoneList<Expression*>* arguments = new ZoneList<Expression*>(2); |
| // Be careful not to assign a value to the global variable if |
| // we're in a with. The initialization value should not |
| // necessarily be stored in the global object in that case, |
| // which is why we need to generate a separate assignment node. |
| arguments->Add(NEW(Literal(name))); // we have at least 1 parameter |
| if (is_const || (value != NULL && !inside_with())) { |
| arguments->Add(value); |
| value = NULL; // zap the value to avoid the unnecessary assignment |
| } |
| // Construct the call to Runtime::DeclareGlobal{Variable,Const}Locally |
| // and add it to the initialization statement block. Note that |
| // this function does different things depending on if we have |
| // 1 or 2 parameters. |
| CallRuntime* initialize; |
| if (is_const) { |
| initialize = |
| NEW(CallRuntime( |
| Factory::InitializeConstGlobal_symbol(), |
| Runtime::FunctionForId(Runtime::kInitializeConstGlobal), |
| arguments)); |
| } else { |
| initialize = |
| NEW(CallRuntime( |
| Factory::InitializeVarGlobal_symbol(), |
| Runtime::FunctionForId(Runtime::kInitializeVarGlobal), |
| arguments)); |
| } |
| block->AddStatement(NEW(ExpressionStatement(initialize))); |
| } |
| |
| // Add an assignment node to the initialization statement block if |
| // we still have a pending initialization value. We must distinguish |
| // between variables and constants: Variable initializations are simply |
| // assignments (with all the consequences if they are inside a 'with' |
| // statement - they may change a 'with' object property). Constant |
| // initializations always assign to the declared constant which is |
| // always at the function scope level. This is only relevant for |
| // dynamically looked-up variables and constants (the start context |
| // for constant lookups is always the function context, while it is |
| // the top context for variables). Sigh... |
| if (value != NULL) { |
| Token::Value op = (is_const ? Token::INIT_CONST : Token::INIT_VAR); |
| Assignment* assignment = NEW(Assignment(op, last_var, value, position)); |
| if (block) block->AddStatement(NEW(ExpressionStatement(assignment))); |
| } |
| } while (peek() == Token::COMMA); |
| |
| if (!is_const && nvars == 1) { |
| // We have a single, non-const variable. |
| if (is_pre_parsing_) { |
| // If we're preparsing then we need to set the var to something |
| // in order for for-in loops to parse correctly. |
| *var = ValidLeftHandSideSentinel::instance(); |
| } else { |
| ASSERT(last_var != NULL); |
| *var = last_var; |
| } |
| } |
| |
| return block; |
| } |
| |
| |
| static bool ContainsLabel(ZoneStringList* labels, Handle<String> label) { |
| ASSERT(!label.is_null()); |
| if (labels != NULL) |
| for (int i = labels->length(); i-- > 0; ) |
| if (labels->at(i).is_identical_to(label)) |
| return true; |
| |
| return false; |
| } |
| |
| |
| Statement* Parser::ParseExpressionOrLabelledStatement(ZoneStringList* labels, |
| bool* ok) { |
| // ExpressionStatement | LabelledStatement :: |
| // Expression ';' |
| // Identifier ':' Statement |
| |
| Expression* expr = ParseExpression(true, CHECK_OK); |
| if (peek() == Token::COLON && expr && |
| expr->AsVariableProxy() != NULL && |
| !expr->AsVariableProxy()->is_this()) { |
| VariableProxy* var = expr->AsVariableProxy(); |
| Handle<String> label = var->name(); |
| // TODO(1240780): We don't check for redeclaration of labels |
| // during preparsing since keeping track of the set of active |
| // labels requires nontrivial changes to the way scopes are |
| // structured. However, these are probably changes we want to |
| // make later anyway so we should go back and fix this then. |
| if (!is_pre_parsing_) { |
| if (ContainsLabel(labels, label) || TargetStackContainsLabel(label)) { |
| SmartPointer<char> c_string = label->ToCString(DISALLOW_NULLS); |
| const char* elms[2] = { "Label", *c_string }; |
| Vector<const char*> args(elms, 2); |
| ReportMessage("redeclaration", args); |
| *ok = false; |
| return NULL; |
| } |
| if (labels == NULL) labels = new ZoneStringList(4); |
| labels->Add(label); |
| // Remove the "ghost" variable that turned out to be a label |
| // from the top scope. This way, we don't try to resolve it |
| // during the scope processing. |
| top_scope_->RemoveUnresolved(var); |
| } |
| Expect(Token::COLON, CHECK_OK); |
| return ParseStatement(labels, ok); |
| } |
| |
| // Parsed expression statement. |
| ExpectSemicolon(CHECK_OK); |
| return NEW(ExpressionStatement(expr)); |
| } |
| |
| |
| IfStatement* Parser::ParseIfStatement(ZoneStringList* labels, bool* ok) { |
| // IfStatement :: |
| // 'if' '(' Expression ')' Statement ('else' Statement)? |
| |
| Expect(Token::IF, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| Expression* condition = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| Statement* then_statement = ParseStatement(labels, CHECK_OK); |
| Statement* else_statement = NULL; |
| if (peek() == Token::ELSE) { |
| Next(); |
| else_statement = ParseStatement(labels, CHECK_OK); |
| } else if (!is_pre_parsing_) { |
| else_statement = factory()->EmptyStatement(); |
| } |
| return NEW(IfStatement(condition, then_statement, else_statement)); |
| } |
| |
| |
| Statement* Parser::ParseContinueStatement(bool* ok) { |
| // ContinueStatement :: |
| // 'continue' Identifier? ';' |
| |
| Expect(Token::CONTINUE, CHECK_OK); |
| Handle<String> label = Handle<String>::null(); |
| Token::Value tok = peek(); |
| if (!scanner_.has_line_terminator_before_next() && |
| tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) { |
| label = ParseIdentifier(CHECK_OK); |
| } |
| IterationStatement* target = NULL; |
| if (!is_pre_parsing_) { |
| target = LookupContinueTarget(label, CHECK_OK); |
| if (target == NULL) { |
| // Illegal continue statement. To be consistent with KJS we delay |
| // reporting of the syntax error until runtime. |
| Handle<String> error_type = Factory::illegal_continue_symbol(); |
| if (!label.is_null()) error_type = Factory::unknown_label_symbol(); |
| Expression* throw_error = NewThrowSyntaxError(error_type, label); |
| return NEW(ExpressionStatement(throw_error)); |
| } |
| } |
| ExpectSemicolon(CHECK_OK); |
| return NEW(ContinueStatement(target)); |
| } |
| |
| |
| Statement* Parser::ParseBreakStatement(ZoneStringList* labels, bool* ok) { |
| // BreakStatement :: |
| // 'break' Identifier? ';' |
| |
| Expect(Token::BREAK, CHECK_OK); |
| Handle<String> label; |
| Token::Value tok = peek(); |
| if (!scanner_.has_line_terminator_before_next() && |
| tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) { |
| label = ParseIdentifier(CHECK_OK); |
| } |
| // Parse labeled break statements that target themselves into |
| // empty statements, e.g. 'l1: l2: l3: break l2;' |
| if (!label.is_null() && ContainsLabel(labels, label)) { |
| return factory()->EmptyStatement(); |
| } |
| BreakableStatement* target = NULL; |
| if (!is_pre_parsing_) { |
| target = LookupBreakTarget(label, CHECK_OK); |
| if (target == NULL) { |
| // Illegal break statement. To be consistent with KJS we delay |
| // reporting of the syntax error until runtime. |
| Handle<String> error_type = Factory::illegal_break_symbol(); |
| if (!label.is_null()) error_type = Factory::unknown_label_symbol(); |
| Expression* throw_error = NewThrowSyntaxError(error_type, label); |
| return NEW(ExpressionStatement(throw_error)); |
| } |
| } |
| ExpectSemicolon(CHECK_OK); |
| return NEW(BreakStatement(target)); |
| } |
| |
| |
| Statement* Parser::ParseReturnStatement(bool* ok) { |
| // ReturnStatement :: |
| // 'return' Expression? ';' |
| |
| // Consume the return token. It is necessary to do the before |
| // reporting any errors on it, because of the way errors are |
| // reported (underlining). |
| Expect(Token::RETURN, CHECK_OK); |
| |
| // An ECMAScript program is considered syntactically incorrect if it |
| // contains a return statement that is not within the body of a |
| // function. See ECMA-262, section 12.9, page 67. |
| // |
| // To be consistent with KJS we report the syntax error at runtime. |
| if (!is_pre_parsing_ && !top_scope_->is_function_scope()) { |
| Handle<String> type = Factory::illegal_return_symbol(); |
| Expression* throw_error = NewThrowSyntaxError(type, Handle<Object>::null()); |
| return NEW(ExpressionStatement(throw_error)); |
| } |
| |
| Token::Value tok = peek(); |
| if (scanner_.has_line_terminator_before_next() || |
| tok == Token::SEMICOLON || |
| tok == Token::RBRACE || |
| tok == Token::EOS) { |
| ExpectSemicolon(CHECK_OK); |
| return NEW(ReturnStatement(GetLiteralUndefined())); |
| } |
| |
| Expression* expr = ParseExpression(true, CHECK_OK); |
| ExpectSemicolon(CHECK_OK); |
| return NEW(ReturnStatement(expr)); |
| } |
| |
| |
| Block* Parser::WithHelper(Expression* obj, |
| ZoneStringList* labels, |
| bool is_catch_block, |
| bool* ok) { |
| // Parse the statement and collect escaping labels. |
| ZoneList<BreakTarget*>* target_list = NEW(ZoneList<BreakTarget*>(0)); |
| TargetCollector collector(target_list); |
| Statement* stat; |
| { Target target(this, &collector); |
| with_nesting_level_++; |
| top_scope_->RecordWithStatement(); |
| stat = ParseStatement(labels, CHECK_OK); |
| with_nesting_level_--; |
| } |
| // Create resulting block with two statements. |
| // 1: Evaluate the with expression. |
| // 2: The try-finally block evaluating the body. |
| Block* result = NEW(Block(NULL, 2, false)); |
| |
| if (result != NULL) { |
| result->AddStatement(NEW(WithEnterStatement(obj, is_catch_block))); |
| |
| // Create body block. |
| Block* body = NEW(Block(NULL, 1, false)); |
| body->AddStatement(stat); |
| |
| // Create exit block. |
| Block* exit = NEW(Block(NULL, 1, false)); |
| exit->AddStatement(NEW(WithExitStatement())); |
| |
| // Return a try-finally statement. |
| TryFinally* wrapper = NEW(TryFinally(body, exit)); |
| wrapper->set_escaping_targets(collector.targets()); |
| result->AddStatement(wrapper); |
| } |
| return result; |
| } |
| |
| |
| Statement* Parser::ParseWithStatement(ZoneStringList* labels, bool* ok) { |
| // WithStatement :: |
| // 'with' '(' Expression ')' Statement |
| |
| Expect(Token::WITH, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| Expression* expr = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| return WithHelper(expr, labels, false, CHECK_OK); |
| } |
| |
| |
| CaseClause* Parser::ParseCaseClause(bool* default_seen_ptr, bool* ok) { |
| // CaseClause :: |
| // 'case' Expression ':' Statement* |
| // 'default' ':' Statement* |
| |
| Expression* label = NULL; // NULL expression indicates default case |
| if (peek() == Token::CASE) { |
| Expect(Token::CASE, CHECK_OK); |
| label = ParseExpression(true, CHECK_OK); |
| } else { |
| Expect(Token::DEFAULT, CHECK_OK); |
| if (*default_seen_ptr) { |
| ReportMessage("multiple_defaults_in_switch", |
| Vector<const char*>::empty()); |
| *ok = false; |
| return NULL; |
| } |
| *default_seen_ptr = true; |
| } |
| Expect(Token::COLON, CHECK_OK); |
| |
| ZoneListWrapper<Statement> statements = factory()->NewList<Statement>(5); |
| while (peek() != Token::CASE && |
| peek() != Token::DEFAULT && |
| peek() != Token::RBRACE) { |
| Statement* stat = ParseStatement(NULL, CHECK_OK); |
| statements.Add(stat); |
| } |
| |
| return NEW(CaseClause(label, statements.elements())); |
| } |
| |
| |
| SwitchStatement* Parser::ParseSwitchStatement(ZoneStringList* labels, |
| bool* ok) { |
| // SwitchStatement :: |
| // 'switch' '(' Expression ')' '{' CaseClause* '}' |
| |
| SwitchStatement* statement = NEW(SwitchStatement(labels)); |
| Target target(this, statement); |
| |
| Expect(Token::SWITCH, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| Expression* tag = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| bool default_seen = false; |
| ZoneListWrapper<CaseClause> cases = factory()->NewList<CaseClause>(4); |
| Expect(Token::LBRACE, CHECK_OK); |
| while (peek() != Token::RBRACE) { |
| CaseClause* clause = ParseCaseClause(&default_seen, CHECK_OK); |
| cases.Add(clause); |
| } |
| Expect(Token::RBRACE, CHECK_OK); |
| |
| if (statement) statement->Initialize(tag, cases.elements()); |
| return statement; |
| } |
| |
| |
| Statement* Parser::ParseThrowStatement(bool* ok) { |
| // ThrowStatement :: |
| // 'throw' Expression ';' |
| |
| Expect(Token::THROW, CHECK_OK); |
| int pos = scanner().location().beg_pos; |
| if (scanner_.has_line_terminator_before_next()) { |
| ReportMessage("newline_after_throw", Vector<const char*>::empty()); |
| *ok = false; |
| return NULL; |
| } |
| Expression* exception = ParseExpression(true, CHECK_OK); |
| ExpectSemicolon(CHECK_OK); |
| |
| return NEW(ExpressionStatement(new Throw(exception, pos))); |
| } |
| |
| |
| TryStatement* Parser::ParseTryStatement(bool* ok) { |
| // TryStatement :: |
| // 'try' Block Catch |
| // 'try' Block Finally |
| // 'try' Block Catch Finally |
| // |
| // Catch :: |
| // 'catch' '(' Identifier ')' Block |
| // |
| // Finally :: |
| // 'finally' Block |
| |
| Expect(Token::TRY, CHECK_OK); |
| |
| ZoneList<BreakTarget*>* target_list = NEW(ZoneList<BreakTarget*>(0)); |
| TargetCollector collector(target_list); |
| Block* try_block; |
| |
| { Target target(this, &collector); |
| try_block = ParseBlock(NULL, CHECK_OK); |
| } |
| |
| Block* catch_block = NULL; |
| VariableProxy* catch_var = NULL; |
| Block* finally_block = NULL; |
| |
| Token::Value tok = peek(); |
| if (tok != Token::CATCH && tok != Token::FINALLY) { |
| ReportMessage("no_catch_or_finally", Vector<const char*>::empty()); |
| *ok = false; |
| return NULL; |
| } |
| |
| // If we can break out from the catch block and there is a finally block, |
| // then we will need to collect jump targets from the catch block. Since |
| // we don't know yet if there will be a finally block, we always collect |
| // the jump targets. |
| ZoneList<BreakTarget*>* catch_target_list = NEW(ZoneList<BreakTarget*>(0)); |
| TargetCollector catch_collector(catch_target_list); |
| bool has_catch = false; |
| if (tok == Token::CATCH) { |
| has_catch = true; |
| Consume(Token::CATCH); |
| |
| Expect(Token::LPAREN, CHECK_OK); |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| if (peek() == Token::LBRACE) { |
| // Allocate a temporary for holding the finally state while |
| // executing the finally block. |
| catch_var = top_scope_->NewTemporary(Factory::catch_var_symbol()); |
| Literal* name_literal = NEW(Literal(name)); |
| Expression* obj = NEW(CatchExtensionObject(name_literal, catch_var)); |
| { Target target(this, &catch_collector); |
| catch_block = WithHelper(obj, NULL, true, CHECK_OK); |
| } |
| } else { |
| Expect(Token::LBRACE, CHECK_OK); |
| } |
| |
| tok = peek(); |
| } |
| |
| if (tok == Token::FINALLY || !has_catch) { |
| Consume(Token::FINALLY); |
| // Declare a variable for holding the finally state while |
| // executing the finally block. |
| finally_block = ParseBlock(NULL, CHECK_OK); |
| } |
| |
| // Simplify the AST nodes by converting: |
| // 'try { } catch { } finally { }' |
| // to: |
| // 'try { try { } catch { } } finally { }' |
| |
| if (!is_pre_parsing_ && catch_block != NULL && finally_block != NULL) { |
| TryCatch* statement = NEW(TryCatch(try_block, catch_var, catch_block)); |
| statement->set_escaping_targets(collector.targets()); |
| try_block = NEW(Block(NULL, 1, false)); |
| try_block->AddStatement(statement); |
| catch_block = NULL; |
| } |
| |
| TryStatement* result = NULL; |
| if (!is_pre_parsing_) { |
| if (catch_block != NULL) { |
| ASSERT(finally_block == NULL); |
| result = NEW(TryCatch(try_block, catch_var, catch_block)); |
| result->set_escaping_targets(collector.targets()); |
| } else { |
| ASSERT(finally_block != NULL); |
| result = NEW(TryFinally(try_block, finally_block)); |
| // Add the jump targets of the try block and the catch block. |
| for (int i = 0; i < collector.targets()->length(); i++) { |
| catch_collector.AddTarget(collector.targets()->at(i)); |
| } |
| result->set_escaping_targets(catch_collector.targets()); |
| } |
| } |
| |
| return result; |
| } |
| |
| |
| LoopStatement* Parser::ParseDoStatement(ZoneStringList* labels, bool* ok) { |
| // DoStatement :: |
| // 'do' Statement 'while' '(' Expression ')' ';' |
| |
| LoopStatement* loop = NEW(LoopStatement(labels, LoopStatement::DO_LOOP)); |
| Target target(this, loop); |
| |
| Expect(Token::DO, CHECK_OK); |
| Statement* body = ParseStatement(NULL, CHECK_OK); |
| Expect(Token::WHILE, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| Expression* cond = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| // Allow do-statements to be terminated with and without |
| // semi-colons. This allows code such as 'do;while(0)return' to |
| // parse, which would not be the case if we had used the |
| // ExpectSemicolon() functionality here. |
| if (peek() == Token::SEMICOLON) Consume(Token::SEMICOLON); |
| |
| if (loop) loop->Initialize(NULL, cond, NULL, body); |
| return loop; |
| } |
| |
| |
| LoopStatement* Parser::ParseWhileStatement(ZoneStringList* labels, bool* ok) { |
| // WhileStatement :: |
| // 'while' '(' Expression ')' Statement |
| |
| LoopStatement* loop = NEW(LoopStatement(labels, LoopStatement::WHILE_LOOP)); |
| Target target(this, loop); |
| |
| Expect(Token::WHILE, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| Expression* cond = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| Statement* body = ParseStatement(NULL, CHECK_OK); |
| |
| if (loop) loop->Initialize(NULL, cond, NULL, body); |
| return loop; |
| } |
| |
| |
| Statement* Parser::ParseForStatement(ZoneStringList* labels, bool* ok) { |
| // ForStatement :: |
| // 'for' '(' Expression? ';' Expression? ';' Expression? ')' Statement |
| |
| Statement* init = NULL; |
| |
| Expect(Token::FOR, CHECK_OK); |
| Expect(Token::LPAREN, CHECK_OK); |
| if (peek() != Token::SEMICOLON) { |
| if (peek() == Token::VAR || peek() == Token::CONST) { |
| Expression* each = NULL; |
| Block* variable_statement = |
| ParseVariableDeclarations(false, &each, CHECK_OK); |
| if (peek() == Token::IN && each != NULL) { |
| ForInStatement* loop = NEW(ForInStatement(labels)); |
| Target target(this, loop); |
| |
| Expect(Token::IN, CHECK_OK); |
| Expression* enumerable = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| Statement* body = ParseStatement(NULL, CHECK_OK); |
| if (is_pre_parsing_) { |
| return NULL; |
| } else { |
| loop->Initialize(each, enumerable, body); |
| Block* result = NEW(Block(NULL, 2, false)); |
| result->AddStatement(variable_statement); |
| result->AddStatement(loop); |
| // Parsed for-in loop w/ variable/const declaration. |
| return result; |
| } |
| |
| } else { |
| init = variable_statement; |
| } |
| |
| } else { |
| Expression* expression = ParseExpression(false, CHECK_OK); |
| if (peek() == Token::IN) { |
| // Signal a reference error if the expression is an invalid |
| // left-hand side expression. We could report this as a syntax |
| // error here but for compatibility with JSC we choose to report |
| // the error at runtime. |
| if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| Handle<String> type = Factory::invalid_lhs_in_for_in_symbol(); |
| expression = NewThrowReferenceError(type); |
| } |
| ForInStatement* loop = NEW(ForInStatement(labels)); |
| Target target(this, loop); |
| |
| Expect(Token::IN, CHECK_OK); |
| Expression* enumerable = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| Statement* body = ParseStatement(NULL, CHECK_OK); |
| if (loop) loop->Initialize(expression, enumerable, body); |
| |
| // Parsed for-in loop. |
| return loop; |
| |
| } else { |
| init = NEW(ExpressionStatement(expression)); |
| } |
| } |
| } |
| |
| // Standard 'for' loop |
| LoopStatement* loop = NEW(LoopStatement(labels, LoopStatement::FOR_LOOP)); |
| Target target(this, loop); |
| |
| // Parsed initializer at this point. |
| Expect(Token::SEMICOLON, CHECK_OK); |
| |
| Expression* cond = NULL; |
| if (peek() != Token::SEMICOLON) { |
| cond = ParseExpression(true, CHECK_OK); |
| } |
| Expect(Token::SEMICOLON, CHECK_OK); |
| |
| Statement* next = NULL; |
| if (peek() != Token::RPAREN) { |
| Expression* exp = ParseExpression(true, CHECK_OK); |
| next = NEW(ExpressionStatement(exp)); |
| } |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| Statement* body = ParseStatement(NULL, CHECK_OK); |
| |
| if (loop) loop->Initialize(init, cond, next, body); |
| return loop; |
| } |
| |
| |
| // Precedence = 1 |
| Expression* Parser::ParseExpression(bool accept_IN, bool* ok) { |
| // Expression :: |
| // AssignmentExpression |
| // Expression ',' AssignmentExpression |
| |
| Expression* result = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| while (peek() == Token::COMMA) { |
| Expect(Token::COMMA, CHECK_OK); |
| Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| result = NEW(BinaryOperation(Token::COMMA, result, right)); |
| } |
| return result; |
| } |
| |
| |
| // Precedence = 2 |
| Expression* Parser::ParseAssignmentExpression(bool accept_IN, bool* ok) { |
| // AssignmentExpression :: |
| // ConditionalExpression |
| // LeftHandSideExpression AssignmentOperator AssignmentExpression |
| |
| Expression* expression = ParseConditionalExpression(accept_IN, CHECK_OK); |
| |
| if (!Token::IsAssignmentOp(peek())) { |
| // Parsed conditional expression only (no assignment). |
| return expression; |
| } |
| |
| // Signal a reference error if the expression is an invalid left-hand |
| // side expression. We could report this as a syntax error here but |
| // for compatibility with JSC we choose to report the error at |
| // runtime. |
| if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| Handle<String> type = Factory::invalid_lhs_in_assignment_symbol(); |
| expression = NewThrowReferenceError(type); |
| } |
| |
| Token::Value op = Next(); // Get assignment operator. |
| int pos = scanner().location().beg_pos; |
| Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| |
| // TODO(1231235): We try to estimate the set of properties set by |
| // constructors. We define a new property whenever there is an |
| // assignment to a property of 'this'. We should probably only add |
| // properties if we haven't seen them before. Otherwise we'll |
| // probably overestimate the number of properties. |
| Property* property = expression ? expression->AsProperty() : NULL; |
| if (op == Token::ASSIGN && |
| property != NULL && |
| property->obj()->AsVariableProxy() != NULL && |
| property->obj()->AsVariableProxy()->is_this()) { |
| temp_scope_->AddProperty(); |
| } |
| |
| return NEW(Assignment(op, expression, right, pos)); |
| } |
| |
| |
| // Precedence = 3 |
| Expression* Parser::ParseConditionalExpression(bool accept_IN, bool* ok) { |
| // ConditionalExpression :: |
| // LogicalOrExpression |
| // LogicalOrExpression '?' AssignmentExpression ':' AssignmentExpression |
| |
| // We start using the binary expression parser for prec >= 4 only! |
| Expression* expression = ParseBinaryExpression(4, accept_IN, CHECK_OK); |
| if (peek() != Token::CONDITIONAL) return expression; |
| Consume(Token::CONDITIONAL); |
| // In parsing the first assignment expression in conditional |
| // expressions we always accept the 'in' keyword; see ECMA-262, |
| // section 11.12, page 58. |
| Expression* left = ParseAssignmentExpression(true, CHECK_OK); |
| Expect(Token::COLON, CHECK_OK); |
| Expression* right = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| return NEW(Conditional(expression, left, right)); |
| } |
| |
| |
| static int Precedence(Token::Value tok, bool accept_IN) { |
| if (tok == Token::IN && !accept_IN) |
| return 0; // 0 precedence will terminate binary expression parsing |
| |
| return Token::Precedence(tok); |
| } |
| |
| |
| // Precedence >= 4 |
| Expression* Parser::ParseBinaryExpression(int prec, bool accept_IN, bool* ok) { |
| ASSERT(prec >= 4); |
| Expression* x = ParseUnaryExpression(CHECK_OK); |
| for (int prec1 = Precedence(peek(), accept_IN); prec1 >= prec; prec1--) { |
| // prec1 >= 4 |
| while (Precedence(peek(), accept_IN) == prec1) { |
| Token::Value op = Next(); |
| Expression* y = ParseBinaryExpression(prec1 + 1, accept_IN, CHECK_OK); |
| |
| // Compute some expressions involving only number literals. |
| if (x && x->AsLiteral() && x->AsLiteral()->handle()->IsNumber() && |
| y && y->AsLiteral() && y->AsLiteral()->handle()->IsNumber()) { |
| double x_val = x->AsLiteral()->handle()->Number(); |
| double y_val = y->AsLiteral()->handle()->Number(); |
| |
| switch (op) { |
| case Token::ADD: |
| x = NewNumberLiteral(x_val + y_val); |
| continue; |
| case Token::SUB: |
| x = NewNumberLiteral(x_val - y_val); |
| continue; |
| case Token::MUL: |
| x = NewNumberLiteral(x_val * y_val); |
| continue; |
| case Token::DIV: |
| x = NewNumberLiteral(x_val / y_val); |
| continue; |
| case Token::BIT_OR: |
| x = NewNumberLiteral(DoubleToInt32(x_val) | DoubleToInt32(y_val)); |
| continue; |
| case Token::BIT_AND: |
| x = NewNumberLiteral(DoubleToInt32(x_val) & DoubleToInt32(y_val)); |
| continue; |
| case Token::BIT_XOR: |
| x = NewNumberLiteral(DoubleToInt32(x_val) ^ DoubleToInt32(y_val)); |
| continue; |
| case Token::SHL: { |
| int value = DoubleToInt32(x_val) << (DoubleToInt32(y_val) & 0x1f); |
| x = NewNumberLiteral(value); |
| continue; |
| } |
| case Token::SHR: { |
| uint32_t shift = DoubleToInt32(y_val) & 0x1f; |
| uint32_t value = DoubleToUint32(x_val) >> shift; |
| x = NewNumberLiteral(value); |
| continue; |
| } |
| case Token::SAR: { |
| uint32_t shift = DoubleToInt32(y_val) & 0x1f; |
| int value = ArithmeticShiftRight(DoubleToInt32(x_val), shift); |
| x = NewNumberLiteral(value); |
| continue; |
| } |
| default: |
| break; |
| } |
| } |
| |
| // Convert constant divisions to multiplications for speed. |
| if (op == Token::DIV && |
| y && y->AsLiteral() && y->AsLiteral()->handle()->IsNumber()) { |
| double y_val = y->AsLiteral()->handle()->Number(); |
| int64_t y_int = static_cast<int64_t>(y_val); |
| // There are rounding issues with this optimization, but they don't |
| // apply if the number to be divided with has a reciprocal that can be |
| // precisely represented as a floating point number. This is the case |
| // if the number is an integer power of 2. Negative integer powers of |
| // 2 work too, but for -2, -1, 1 and 2 we don't do the strength |
| // reduction because the inlined optimistic idiv has a reasonable |
| // chance of succeeding by producing a Smi answer with no remainder. |
| if (static_cast<double>(y_int) == y_val && |
| (IsPowerOf2(y_int) || IsPowerOf2(-y_int)) && |
| (y_int > 2 || y_int < -2)) { |
| y = NewNumberLiteral(1 / y_val); |
| op = Token::MUL; |
| } |
| } |
| |
| // For now we distinguish between comparisons and other binary |
| // operations. (We could combine the two and get rid of this |
| // code an AST node eventually.) |
| if (Token::IsCompareOp(op)) { |
| // We have a comparison. |
| Token::Value cmp = op; |
| switch (op) { |
| case Token::NE: cmp = Token::EQ; break; |
| case Token::NE_STRICT: cmp = Token::EQ_STRICT; break; |
| default: break; |
| } |
| x = NEW(CompareOperation(cmp, x, y)); |
| if (cmp != op) { |
| // The comparison was negated - add a NOT. |
| x = NEW(UnaryOperation(Token::NOT, x)); |
| } |
| |
| } else { |
| // We have a "normal" binary operation. |
| x = NEW(BinaryOperation(op, x, y)); |
| } |
| } |
| } |
| return x; |
| } |
| |
| |
| Expression* Parser::ParseUnaryExpression(bool* ok) { |
| // UnaryExpression :: |
| // PostfixExpression |
| // 'delete' UnaryExpression |
| // 'void' UnaryExpression |
| // 'typeof' UnaryExpression |
| // '++' UnaryExpression |
| // '--' UnaryExpression |
| // '+' UnaryExpression |
| // '-' UnaryExpression |
| // '~' UnaryExpression |
| // '!' UnaryExpression |
| |
| Token::Value op = peek(); |
| if (Token::IsUnaryOp(op)) { |
| op = Next(); |
| Expression* expression = ParseUnaryExpression(CHECK_OK); |
| |
| // Compute some expressions involving only number literals. |
| if (expression != NULL && expression->AsLiteral() && |
| expression->AsLiteral()->handle()->IsNumber()) { |
| double value = expression->AsLiteral()->handle()->Number(); |
| switch (op) { |
| case Token::ADD: |
| return expression; |
| case Token::SUB: |
| return NewNumberLiteral(-value); |
| case Token::BIT_NOT: |
| return NewNumberLiteral(~DoubleToInt32(value)); |
| default: break; |
| } |
| } |
| |
| return NEW(UnaryOperation(op, expression)); |
| |
| } else if (Token::IsCountOp(op)) { |
| op = Next(); |
| Expression* expression = ParseUnaryExpression(CHECK_OK); |
| // Signal a reference error if the expression is an invalid |
| // left-hand side expression. We could report this as a syntax |
| // error here but for compatibility with JSC we choose to report the |
| // error at runtime. |
| if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| Handle<String> type = Factory::invalid_lhs_in_prefix_op_symbol(); |
| expression = NewThrowReferenceError(type); |
| } |
| return NEW(CountOperation(true /* prefix */, op, expression)); |
| |
| } else { |
| return ParsePostfixExpression(ok); |
| } |
| } |
| |
| |
| Expression* Parser::ParsePostfixExpression(bool* ok) { |
| // PostfixExpression :: |
| // LeftHandSideExpression ('++' | '--')? |
| |
| Expression* expression = ParseLeftHandSideExpression(CHECK_OK); |
| if (!scanner_.has_line_terminator_before_next() && Token::IsCountOp(peek())) { |
| // Signal a reference error if the expression is an invalid |
| // left-hand side expression. We could report this as a syntax |
| // error here but for compatibility with JSC we choose to report the |
| // error at runtime. |
| if (expression == NULL || !expression->IsValidLeftHandSide()) { |
| Handle<String> type = Factory::invalid_lhs_in_postfix_op_symbol(); |
| expression = NewThrowReferenceError(type); |
| } |
| Token::Value next = Next(); |
| expression = NEW(CountOperation(false /* postfix */, next, expression)); |
| } |
| return expression; |
| } |
| |
| |
| Expression* Parser::ParseLeftHandSideExpression(bool* ok) { |
| // LeftHandSideExpression :: |
| // (NewExpression | MemberExpression) ... |
| |
| Expression* result; |
| if (peek() == Token::NEW) { |
| result = ParseNewExpression(CHECK_OK); |
| } else { |
| result = ParseMemberExpression(CHECK_OK); |
| } |
| |
| while (true) { |
| switch (peek()) { |
| case Token::LBRACK: { |
| Consume(Token::LBRACK); |
| int pos = scanner().location().beg_pos; |
| Expression* index = ParseExpression(true, CHECK_OK); |
| result = factory()->NewProperty(result, index, pos); |
| Expect(Token::RBRACK, CHECK_OK); |
| break; |
| } |
| |
| case Token::LPAREN: { |
| int pos = scanner().location().beg_pos; |
| ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
| |
| // Keep track of eval() calls since they disable all local variable |
| // optimizations. |
| // The calls that need special treatment are the |
| // direct (i.e. not aliased) eval calls. These calls are all of the |
| // form eval(...) with no explicit receiver object where eval is not |
| // declared in the current scope chain. These calls are marked as |
| // potentially direct eval calls. Whether they are actually direct calls |
| // to eval is determined at run time. |
| if (!is_pre_parsing_) { |
| VariableProxy* callee = result->AsVariableProxy(); |
| if (callee != NULL && callee->IsVariable(Factory::eval_symbol())) { |
| Handle<String> name = callee->name(); |
| Variable* var = top_scope_->Lookup(name); |
| if (var == NULL) { |
| top_scope_->RecordEvalCall(); |
| } |
| } |
| } |
| result = factory()->NewCall(result, args, pos); |
| break; |
| } |
| |
| case Token::PERIOD: { |
| Consume(Token::PERIOD); |
| int pos = scanner().location().beg_pos; |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| result = factory()->NewProperty(result, NEW(Literal(name)), pos); |
| break; |
| } |
| |
| default: |
| return result; |
| } |
| } |
| } |
| |
| |
| |
| Expression* Parser::ParseNewPrefix(PositionStack* stack, bool* ok) { |
| // NewExpression :: |
| // ('new')+ MemberExpression |
| |
| // The grammar for new expressions is pretty warped. The keyword |
| // 'new' can either be a part of the new expression (where it isn't |
| // followed by an argument list) or a part of the member expression, |
| // where it must be followed by an argument list. To accommodate |
| // this, we parse the 'new' keywords greedily and keep track of how |
| // many we have parsed. This information is then passed on to the |
| // member expression parser, which is only allowed to match argument |
| // lists as long as it has 'new' prefixes left |
| Expect(Token::NEW, CHECK_OK); |
| PositionStack::Element pos(stack, scanner().location().beg_pos); |
| |
| Expression* result; |
| if (peek() == Token::NEW) { |
| result = ParseNewPrefix(stack, CHECK_OK); |
| } else { |
| result = ParseMemberWithNewPrefixesExpression(stack, CHECK_OK); |
| } |
| |
| if (!stack->is_empty()) { |
| int last = stack->pop(); |
| result = NEW(CallNew(result, new ZoneList<Expression*>(0), last)); |
| } |
| return result; |
| } |
| |
| |
| Expression* Parser::ParseNewExpression(bool* ok) { |
| PositionStack stack(ok); |
| return ParseNewPrefix(&stack, ok); |
| } |
| |
| |
| Expression* Parser::ParseMemberExpression(bool* ok) { |
| return ParseMemberWithNewPrefixesExpression(NULL, ok); |
| } |
| |
| |
| Expression* Parser::ParseMemberWithNewPrefixesExpression(PositionStack* stack, |
| bool* ok) { |
| // MemberExpression :: |
| // (PrimaryExpression | FunctionLiteral) |
| // ('[' Expression ']' | '.' Identifier | Arguments)* |
| |
| // Parse the initial primary or function expression. |
| Expression* result = NULL; |
| if (peek() == Token::FUNCTION) { |
| Expect(Token::FUNCTION, CHECK_OK); |
| int function_token_position = scanner().location().beg_pos; |
| Handle<String> name; |
| if (peek() == Token::IDENTIFIER) name = ParseIdentifier(CHECK_OK); |
| result = ParseFunctionLiteral(name, function_token_position, |
| NESTED, CHECK_OK); |
| } else { |
| result = ParsePrimaryExpression(CHECK_OK); |
| } |
| |
| while (true) { |
| switch (peek()) { |
| case Token::LBRACK: { |
| Consume(Token::LBRACK); |
| int pos = scanner().location().beg_pos; |
| Expression* index = ParseExpression(true, CHECK_OK); |
| result = factory()->NewProperty(result, index, pos); |
| Expect(Token::RBRACK, CHECK_OK); |
| break; |
| } |
| case Token::PERIOD: { |
| Consume(Token::PERIOD); |
| int pos = scanner().location().beg_pos; |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| result = factory()->NewProperty(result, NEW(Literal(name)), pos); |
| break; |
| } |
| case Token::LPAREN: { |
| if ((stack == NULL) || stack->is_empty()) return result; |
| // Consume one of the new prefixes (already parsed). |
| ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
| int last = stack->pop(); |
| result = NEW(CallNew(result, args, last)); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| |
| DebuggerStatement* Parser::ParseDebuggerStatement(bool* ok) { |
| // In ECMA-262 'debugger' is defined as a reserved keyword. In some browser |
| // contexts this is used as a statement which invokes the debugger as i a |
| // break point is present. |
| // DebuggerStatement :: |
| // 'debugger' ';' |
| |
| Expect(Token::DEBUGGER, CHECK_OK); |
| ExpectSemicolon(CHECK_OK); |
| return NEW(DebuggerStatement()); |
| } |
| |
| |
| void Parser::ReportUnexpectedToken(Token::Value token) { |
| // We don't report stack overflows here, to avoid increasing the |
| // stack depth even further. Instead we report it after parsing is |
| // over, in ParseProgram. |
| if (token == Token::ILLEGAL && scanner().stack_overflow()) |
| return; |
| // Four of the tokens are treated specially |
| switch (token) { |
| case Token::EOS: |
| return ReportMessage("unexpected_eos", Vector<const char*>::empty()); |
| case Token::NUMBER: |
| return ReportMessage("unexpected_token_number", |
| Vector<const char*>::empty()); |
| case Token::STRING: |
| return ReportMessage("unexpected_token_string", |
| Vector<const char*>::empty()); |
| case Token::IDENTIFIER: |
| return ReportMessage("unexpected_token_identifier", |
| Vector<const char*>::empty()); |
| default: |
| const char* name = Token::String(token); |
| ASSERT(name != NULL); |
| ReportMessage("unexpected_token", Vector<const char*>(&name, 1)); |
| } |
| } |
| |
| |
| Expression* Parser::ParsePrimaryExpression(bool* ok) { |
| // PrimaryExpression :: |
| // 'this' |
| // 'null' |
| // 'true' |
| // 'false' |
| // Identifier |
| // Number |
| // String |
| // ArrayLiteral |
| // ObjectLiteral |
| // RegExpLiteral |
| // '(' Expression ')' |
| |
| Expression* result = NULL; |
| switch (peek()) { |
| case Token::THIS: { |
| Consume(Token::THIS); |
| if (is_pre_parsing_) { |
| result = VariableProxySentinel::this_proxy(); |
| } else { |
| VariableProxy* recv = top_scope_->receiver(); |
| recv->var_uses()->RecordRead(1); |
| result = recv; |
| } |
| break; |
| } |
| |
| case Token::NULL_LITERAL: |
| Consume(Token::NULL_LITERAL); |
| result = NEW(Literal(Factory::null_value())); |
| break; |
| |
| case Token::TRUE_LITERAL: |
| Consume(Token::TRUE_LITERAL); |
| result = NEW(Literal(Factory::true_value())); |
| break; |
| |
| case Token::FALSE_LITERAL: |
| Consume(Token::FALSE_LITERAL); |
| result = NEW(Literal(Factory::false_value())); |
| break; |
| |
| case Token::IDENTIFIER: { |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| if (is_pre_parsing_) { |
| result = VariableProxySentinel::identifier_proxy(); |
| } else { |
| result = top_scope_->NewUnresolved(name, inside_with()); |
| } |
| break; |
| } |
| |
| case Token::NUMBER: { |
| Consume(Token::NUMBER); |
| double value = |
| StringToDouble(scanner_.literal_string(), ALLOW_HEX | ALLOW_OCTALS); |
| result = NewNumberLiteral(value); |
| break; |
| } |
| |
| case Token::STRING: { |
| Consume(Token::STRING); |
| Handle<String> symbol = |
| factory()->LookupSymbol(scanner_.literal_string(), |
| scanner_.literal_length()); |
| result = NEW(Literal(symbol)); |
| break; |
| } |
| |
| case Token::ASSIGN_DIV: |
| result = ParseRegExpLiteral(true, CHECK_OK); |
| break; |
| |
| case Token::DIV: |
| result = ParseRegExpLiteral(false, CHECK_OK); |
| break; |
| |
| case Token::LBRACK: |
| result = ParseArrayLiteral(CHECK_OK); |
| break; |
| |
| case Token::LBRACE: |
| result = ParseObjectLiteral(CHECK_OK); |
| break; |
| |
| case Token::LPAREN: |
| Consume(Token::LPAREN); |
| result = ParseExpression(true, CHECK_OK); |
| Expect(Token::RPAREN, CHECK_OK); |
| break; |
| |
| case Token::MOD: |
| if (allow_natives_syntax_ || extension_ != NULL) { |
| result = ParseV8Intrinsic(CHECK_OK); |
| break; |
| } |
| // If we're not allowing special syntax we fall-through to the |
| // default case. |
| |
| default: { |
| Token::Value tok = peek(); |
| // Token::Peek returns the value of the next token but |
| // location() gives info about the current token. |
| // Therefore, we need to read ahead to the next token |
| Next(); |
| ReportUnexpectedToken(tok); |
| *ok = false; |
| return NULL; |
| } |
| } |
| |
| return result; |
| } |
| |
| |
| Expression* Parser::ParseArrayLiteral(bool* ok) { |
| // ArrayLiteral :: |
| // '[' Expression? (',' Expression?)* ']' |
| |
| ZoneListWrapper<Expression> values = factory()->NewList<Expression>(4); |
| Expect(Token::LBRACK, CHECK_OK); |
| while (peek() != Token::RBRACK) { |
| Expression* elem; |
| if (peek() == Token::COMMA) { |
| elem = GetLiteralTheHole(); |
| } else { |
| elem = ParseAssignmentExpression(true, CHECK_OK); |
| } |
| values.Add(elem); |
| if (peek() != Token::RBRACK) { |
| Expect(Token::COMMA, CHECK_OK); |
| } |
| } |
| Expect(Token::RBRACK, CHECK_OK); |
| |
| // Update the scope information before the pre-parsing bailout. |
| temp_scope_->set_contains_array_literal(); |
| int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
| |
| if (is_pre_parsing_) return NULL; |
| |
| // Allocate a fixed array with all the literals. |
| Handle<FixedArray> literals = |
| Factory::NewFixedArray(values.length(), TENURED); |
| |
| // Fill in the literals. |
| bool is_simple = true; |
| int depth = 1; |
| for (int i = 0; i < values.length(); i++) { |
| MaterializedLiteral* m_literal = values.at(i)->AsMaterializedLiteral(); |
| if (m_literal != NULL && m_literal->depth() + 1 > depth) { |
| depth = m_literal->depth() + 1; |
| } |
| Handle<Object> boilerplate_value = GetBoilerplateValue(values.at(i)); |
| if (boilerplate_value->IsUndefined()) { |
| literals->set_the_hole(i); |
| is_simple = false; |
| } else { |
| literals->set(i, *boilerplate_value); |
| } |
| } |
| |
| return NEW(ArrayLiteral(literals, values.elements(), |
| literal_index, is_simple, depth)); |
| } |
| |
| |
| bool Parser::IsBoilerplateProperty(ObjectLiteral::Property* property) { |
| return property != NULL && |
| property->kind() != ObjectLiteral::Property::PROTOTYPE; |
| } |
| |
| |
| bool CompileTimeValue::IsCompileTimeValue(Expression* expression) { |
| MaterializedLiteral* lit = expression->AsMaterializedLiteral(); |
| return lit != NULL && lit->is_simple(); |
| } |
| |
| Handle<FixedArray> CompileTimeValue::GetValue(Expression* expression) { |
| ASSERT(IsCompileTimeValue(expression)); |
| Handle<FixedArray> result = Factory::NewFixedArray(2, TENURED); |
| ObjectLiteral* object_literal = expression->AsObjectLiteral(); |
| if (object_literal != NULL) { |
| ASSERT(object_literal->is_simple()); |
| result->set(kTypeSlot, Smi::FromInt(OBJECT_LITERAL)); |
| result->set(kElementsSlot, *object_literal->constant_properties()); |
| } else { |
| ArrayLiteral* array_literal = expression->AsArrayLiteral(); |
| ASSERT(array_literal != NULL && array_literal->is_simple()); |
| result->set(kTypeSlot, Smi::FromInt(ARRAY_LITERAL)); |
| result->set(kElementsSlot, *array_literal->literals()); |
| } |
| return result; |
| } |
| |
| |
| CompileTimeValue::Type CompileTimeValue::GetType(Handle<FixedArray> value) { |
| Smi* type_value = Smi::cast(value->get(kTypeSlot)); |
| return static_cast<Type>(type_value->value()); |
| } |
| |
| |
| Handle<FixedArray> CompileTimeValue::GetElements(Handle<FixedArray> value) { |
| return Handle<FixedArray>(FixedArray::cast(value->get(kElementsSlot))); |
| } |
| |
| |
| Handle<Object> Parser::GetBoilerplateValue(Expression* expression) { |
| if (expression->AsLiteral() != NULL) { |
| return expression->AsLiteral()->handle(); |
| } |
| if (CompileTimeValue::IsCompileTimeValue(expression)) { |
| return CompileTimeValue::GetValue(expression); |
| } |
| return Factory::undefined_value(); |
| } |
| |
| |
| Expression* Parser::ParseObjectLiteral(bool* ok) { |
| // ObjectLiteral :: |
| // '{' ( |
| // ((Identifier | String | Number) ':' AssignmentExpression) |
| // | (('get' | 'set') FunctionLiteral) |
| // )*[','] '}' |
| |
| ZoneListWrapper<ObjectLiteral::Property> properties = |
| factory()->NewList<ObjectLiteral::Property>(4); |
| int number_of_boilerplate_properties = 0; |
| |
| Expect(Token::LBRACE, CHECK_OK); |
| while (peek() != Token::RBRACE) { |
| Literal* key = NULL; |
| switch (peek()) { |
| case Token::IDENTIFIER: { |
| // Store identifier keys as literal symbols to avoid |
| // resolving them when compiling code for the object |
| // literal. |
| bool is_getter = false; |
| bool is_setter = false; |
| Handle<String> id = |
| ParseIdentifierOrGetOrSet(&is_getter, &is_setter, CHECK_OK); |
| if (is_getter || is_setter) { |
| // Special handling of getter and setter syntax. |
| if (peek() == Token::IDENTIFIER) { |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| FunctionLiteral* value = |
| ParseFunctionLiteral(name, RelocInfo::kNoPosition, |
| DECLARATION, CHECK_OK); |
| ObjectLiteral::Property* property = |
| NEW(ObjectLiteral::Property(is_getter, value)); |
| if (IsBoilerplateProperty(property)) |
| number_of_boilerplate_properties++; |
| properties.Add(property); |
| if (peek() != Token::RBRACE) Expect(Token::COMMA, CHECK_OK); |
| continue; // restart the while |
| } |
| } |
| key = NEW(Literal(id)); |
| break; |
| } |
| |
| case Token::STRING: { |
| Consume(Token::STRING); |
| Handle<String> string = |
| factory()->LookupSymbol(scanner_.literal_string(), |
| scanner_.literal_length()); |
| uint32_t index; |
| if (!string.is_null() && string->AsArrayIndex(&index)) { |
| key = NewNumberLiteral(index); |
| } else { |
| key = NEW(Literal(string)); |
| } |
| break; |
| } |
| |
| case Token::NUMBER: { |
| Consume(Token::NUMBER); |
| double value = |
| StringToDouble(scanner_.literal_string(), ALLOW_HEX | ALLOW_OCTALS); |
| key = NewNumberLiteral(value); |
| break; |
| } |
| |
| default: |
| Expect(Token::RBRACE, CHECK_OK); |
| break; |
| } |
| |
| Expect(Token::COLON, CHECK_OK); |
| Expression* value = ParseAssignmentExpression(true, CHECK_OK); |
| |
| ObjectLiteral::Property* property = |
| NEW(ObjectLiteral::Property(key, value)); |
| |
| // Count CONSTANT or COMPUTED properties to maintain the enumeration order. |
| if (IsBoilerplateProperty(property)) number_of_boilerplate_properties++; |
| properties.Add(property); |
| |
| // TODO(1240767): Consider allowing trailing comma. |
| if (peek() != Token::RBRACE) Expect(Token::COMMA, CHECK_OK); |
| } |
| Expect(Token::RBRACE, CHECK_OK); |
| // Computation of literal_index must happen before pre parse bailout. |
| int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
| if (is_pre_parsing_) return NULL; |
| |
| Handle<FixedArray> constant_properties = |
| Factory::NewFixedArray(number_of_boilerplate_properties * 2, TENURED); |
| int position = 0; |
| bool is_simple = true; |
| int depth = 1; |
| for (int i = 0; i < properties.length(); i++) { |
| ObjectLiteral::Property* property = properties.at(i); |
| if (!IsBoilerplateProperty(property)) { |
| is_simple = false; |
| continue; |
| } |
| MaterializedLiteral* m_literal = property->value()->AsMaterializedLiteral(); |
| if (m_literal != NULL && m_literal->depth() + 1 > depth) { |
| depth = m_literal->depth() + 1; |
| } |
| |
| // Add CONSTANT and COMPUTED properties to boilerplate. Use undefined |
| // value for COMPUTED properties, the real value is filled in at |
| // runtime. The enumeration order is maintained. |
| Handle<Object> key = property->key()->handle(); |
| Handle<Object> value = GetBoilerplateValue(property->value()); |
| is_simple = is_simple && !value->IsUndefined(); |
| |
| // Add name, value pair to the fixed array. |
| constant_properties->set(position++, *key); |
| constant_properties->set(position++, *value); |
| } |
| |
| return new ObjectLiteral(constant_properties, |
| properties.elements(), |
| literal_index, |
| is_simple, |
| depth); |
| } |
| |
| |
| Expression* Parser::ParseRegExpLiteral(bool seen_equal, bool* ok) { |
| if (!scanner_.ScanRegExpPattern(seen_equal)) { |
| Next(); |
| ReportMessage("unterminated_regexp", Vector<const char*>::empty()); |
| *ok = false; |
| return NULL; |
| } |
| |
| int literal_index = temp_scope_->NextMaterializedLiteralIndex(); |
| |
| if (is_pre_parsing_) { |
| // If we're preparsing we just do all the parsing stuff without |
| // building anything. |
| if (!scanner_.ScanRegExpFlags()) { |
| Next(); |
| ReportMessage("invalid_regexp_flags", Vector<const char*>::empty()); |
| *ok = false; |
| return NULL; |
| } |
| Next(); |
| return NULL; |
| } |
| |
| Handle<String> js_pattern = |
| Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED); |
| scanner_.ScanRegExpFlags(); |
| Handle<String> js_flags = |
| Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED); |
| Next(); |
| |
| return new RegExpLiteral(js_pattern, js_flags, literal_index); |
| } |
| |
| |
| ZoneList<Expression*>* Parser::ParseArguments(bool* ok) { |
| // Arguments :: |
| // '(' (AssignmentExpression)*[','] ')' |
| |
| ZoneListWrapper<Expression> result = factory()->NewList<Expression>(4); |
| Expect(Token::LPAREN, CHECK_OK); |
| bool done = (peek() == Token::RPAREN); |
| while (!done) { |
| Expression* argument = ParseAssignmentExpression(true, CHECK_OK); |
| result.Add(argument); |
| done = (peek() == Token::RPAREN); |
| if (!done) Expect(Token::COMMA, CHECK_OK); |
| } |
| Expect(Token::RPAREN, CHECK_OK); |
| return result.elements(); |
| } |
| |
| |
| FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name, |
| int function_token_position, |
| FunctionLiteralType type, |
| bool* ok) { |
| // Function :: |
| // '(' FormalParameterList? ')' '{' FunctionBody '}' |
| |
| bool is_named = !var_name.is_null(); |
| |
| // The name associated with this function. If it's a function expression, |
| // this is the actual function name, otherwise this is the name of the |
| // variable declared and initialized with the function (expression). In |
| // that case, we don't have a function name (it's empty). |
| Handle<String> name = is_named ? var_name : factory()->EmptySymbol(); |
| // The function name, if any. |
| Handle<String> function_name = factory()->EmptySymbol(); |
| if (is_named && (type == EXPRESSION || type == NESTED)) { |
| function_name = name; |
| } |
| |
| int num_parameters = 0; |
| // Parse function body. |
| { Scope::Type type = Scope::FUNCTION_SCOPE; |
| Scope* scope = factory()->NewScope(top_scope_, type, inside_with()); |
| LexicalScope lexical_scope(this, scope); |
| TemporaryScope temp_scope(this); |
| top_scope_->SetScopeName(name); |
| |
| // FormalParameterList :: |
| // '(' (Identifier)*[','] ')' |
| Expect(Token::LPAREN, CHECK_OK); |
| int start_pos = scanner_.location().beg_pos; |
| bool done = (peek() == Token::RPAREN); |
| while (!done) { |
| Handle<String> param_name = ParseIdentifier(CHECK_OK); |
| if (!is_pre_parsing_) { |
| top_scope_->AddParameter(top_scope_->DeclareLocal(param_name, |
| Variable::VAR)); |
| num_parameters++; |
| } |
| done = (peek() == Token::RPAREN); |
| if (!done) Expect(Token::COMMA, CHECK_OK); |
| } |
| Expect(Token::RPAREN, CHECK_OK); |
| |
| Expect(Token::LBRACE, CHECK_OK); |
| ZoneListWrapper<Statement> body = factory()->NewList<Statement>(8); |
| |
| // If we have a named function expression, we add a local variable |
| // declaration to the body of the function with the name of the |
| // function and let it refer to the function itself (closure). |
| // NOTE: We create a proxy and resolve it here so that in the |
| // future we can change the AST to only refer to VariableProxies |
| // instead of Variables and Proxis as is the case now. |
| if (!function_name.is_null() && function_name->length() > 0) { |
| Variable* fvar = top_scope_->DeclareFunctionVar(function_name); |
| VariableProxy* fproxy = |
| top_scope_->NewUnresolved(function_name, inside_with()); |
| fproxy->BindTo(fvar); |
| body.Add(new ExpressionStatement( |
| new Assignment(Token::INIT_VAR, fproxy, |
| NEW(ThisFunction()), |
| RelocInfo::kNoPosition))); |
| } |
| |
| // Determine if the function will be lazily compiled. The mode can |
| // only be PARSE_LAZILY if the --lazy flag is true. |
| bool is_lazily_compiled = |
| mode() == PARSE_LAZILY && top_scope_->HasTrivialOuterContext(); |
| |
| int materialized_literal_count; |
| int expected_property_count; |
| bool contains_array_literal; |
| bool only_this_property_assignments; |
| bool only_simple_this_property_assignments; |
| Handle<FixedArray> this_property_assignments; |
| if (is_lazily_compiled && pre_data() != NULL) { |
| FunctionEntry entry = pre_data()->GetFunctionEnd(start_pos); |
| int end_pos = entry.end_pos(); |
| Counters::total_preparse_skipped.Increment(end_pos - start_pos); |
| scanner_.SeekForward(end_pos); |
| materialized_literal_count = entry.literal_count(); |
| expected_property_count = entry.property_count(); |
| only_this_property_assignments = false; |
| only_simple_this_property_assignments = false; |
| this_property_assignments = Factory::empty_fixed_array(); |
| contains_array_literal = entry.contains_array_literal(); |
| } else { |
| ParseSourceElements(&body, Token::RBRACE, CHECK_OK); |
| materialized_literal_count = temp_scope.materialized_literal_count(); |
| expected_property_count = temp_scope.expected_property_count(); |
| contains_array_literal = temp_scope.contains_array_literal(); |
| only_this_property_assignments = |
| temp_scope.only_this_property_assignments(); |
| only_simple_this_property_assignments = |
| temp_scope.only_simple_this_property_assignments(); |
| this_property_assignments = temp_scope.this_property_assignments(); |
| } |
| |
| Expect(Token::RBRACE, CHECK_OK); |
| int end_pos = scanner_.location().end_pos; |
| |
| FunctionEntry entry = log()->LogFunction(start_pos); |
| if (entry.is_valid()) { |
| entry.set_end_pos(end_pos); |
| entry.set_literal_count(materialized_literal_count); |
| entry.set_property_count(expected_property_count); |
| entry.set_contains_array_literal(contains_array_literal); |
| } |
| |
| FunctionLiteral* function_literal = |
| NEW(FunctionLiteral(name, |
| top_scope_, |
| body.elements(), |
| materialized_literal_count, |
| contains_array_literal, |
| expected_property_count, |
| only_this_property_assignments, |
| only_simple_this_property_assignments, |
| this_property_assignments, |
| num_parameters, |
| start_pos, |
| end_pos, |
| function_name->length() > 0)); |
| if (!is_pre_parsing_) { |
| function_literal->set_function_token_position(function_token_position); |
| } |
| return function_literal; |
| } |
| } |
| |
| |
| Expression* Parser::ParseV8Intrinsic(bool* ok) { |
| // CallRuntime :: |
| // '%' Identifier Arguments |
| |
| Expect(Token::MOD, CHECK_OK); |
| Handle<String> name = ParseIdentifier(CHECK_OK); |
| Runtime::Function* function = |
| Runtime::FunctionForName(scanner_.literal_string()); |
| ZoneList<Expression*>* args = ParseArguments(CHECK_OK); |
| if (function == NULL && extension_ != NULL) { |
| // The extension structures are only accessible while parsing the |
| // very first time not when reparsing because of lazy compilation. |
| top_scope_->ForceEagerCompilation(); |
| } |
| |
| // Check for built-in macros. |
| if (!is_pre_parsing_) { |
| if (function == Runtime::FunctionForId(Runtime::kIS_VAR)) { |
| // %IS_VAR(x) |
| // evaluates to x if x is a variable, |
| // leads to a parse error otherwise |
| if (args->length() == 1 && args->at(0)->AsVariableProxy() != NULL) { |
| return args->at(0); |
| } |
| *ok = false; |
| // Check here for other macros. |
| // } else if (function == Runtime::FunctionForId(Runtime::kIS_VAR)) { |
| // ... |
| } |
| |
| if (!*ok) { |
| // We found a macro but it failed. |
| ReportMessage("unable_to_parse", Vector<const char*>::empty()); |
| return NULL; |
| } |
| } |
| |
| // Otherwise we have a runtime call. |
| return NEW(CallRuntime(name, function, args)); |
| } |
| |
| |
| void Parser::Consume(Token::Value token) { |
| Token::Value next = Next(); |
| USE(next); |
| USE(token); |
| ASSERT(next == token); |
| } |
| |
| |
| void Parser::Expect(Token::Value token, bool* ok) { |
| Token::Value next = Next(); |
| if (next == token) return; |
| ReportUnexpectedToken(next); |
| *ok = false; |
| } |
| |
| |
| void Parser::ExpectSemicolon(bool* ok) { |
| // Check for automatic semicolon insertion according to |
| // the rules given in ECMA-262, section 7.9, page 21. |
| Token::Value tok = peek(); |
| if (tok == Token::SEMICOLON) { |
| Next(); |
| return; |
| } |
| if (scanner_.has_line_terminator_before_next() || |
| tok == Token::RBRACE || |
| tok == Token::EOS) { |
| return; |
| } |
| Expect(Token::SEMICOLON, ok); |
| } |
| |
| |
| Literal* Parser::GetLiteralUndefined() { |
| return NEW(Literal(Factory::undefined_value())); |
| } |
| |
| |
| Literal* Parser::GetLiteralTheHole() { |
| return NEW(Literal(Factory::the_hole_value())); |
| } |
| |
| |
| Literal* Parser::GetLiteralNumber(double value) { |
| return NewNumberLiteral(value); |
| } |
| |
| |
| Handle<String> Parser::ParseIdentifier(bool* ok) { |
| Expect(Token::IDENTIFIER, ok); |
| if (!*ok) return Handle<String>(); |
| return factory()->LookupSymbol(scanner_.literal_string(), |
| scanner_.literal_length()); |
| } |
| |
| // This function reads an identifier and determines whether or not it |
| // is 'get' or 'set'. The reason for not using ParseIdentifier and |
| // checking on the output is that this involves heap allocation which |
| // we can't do during preparsing. |
| Handle<String> Parser::ParseIdentifierOrGetOrSet(bool* is_get, |
| bool* is_set, |
| bool* ok) { |
| Expect(Token::IDENTIFIER, ok); |
| if (!*ok) return Handle<String>(); |
| if (scanner_.literal_length() == 3) { |
| const char* token = scanner_.literal_string(); |
| *is_get = strcmp(token, "get") == 0; |
| *is_set = !*is_get && strcmp(token, "set") == 0; |
| } |
| return factory()->LookupSymbol(scanner_.literal_string(), |
| scanner_.literal_length()); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Parser support |
| |
| |
| bool Parser::TargetStackContainsLabel(Handle<String> label) { |
| for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| BreakableStatement* stat = t->node()->AsBreakableStatement(); |
| if (stat != NULL && ContainsLabel(stat->labels(), label)) |
| return true; |
| } |
| return false; |
| } |
| |
| |
| BreakableStatement* Parser::LookupBreakTarget(Handle<String> label, bool* ok) { |
| bool anonymous = label.is_null(); |
| for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| BreakableStatement* stat = t->node()->AsBreakableStatement(); |
| if (stat == NULL) continue; |
| if ((anonymous && stat->is_target_for_anonymous()) || |
| (!anonymous && ContainsLabel(stat->labels(), label))) { |
| RegisterTargetUse(stat->break_target(), t->previous()); |
| return stat; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| IterationStatement* Parser::LookupContinueTarget(Handle<String> label, |
| bool* ok) { |
| bool anonymous = label.is_null(); |
| for (Target* t = target_stack_; t != NULL; t = t->previous()) { |
| IterationStatement* stat = t->node()->AsIterationStatement(); |
| if (stat == NULL) continue; |
| |
| ASSERT(stat->is_target_for_anonymous()); |
| if (anonymous || ContainsLabel(stat->labels(), label)) { |
| RegisterTargetUse(stat->continue_target(), t->previous()); |
| return stat; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| void Parser::RegisterTargetUse(BreakTarget* target, Target* stop) { |
| // Register that a break target found at the given stop in the |
| // target stack has been used from the top of the target stack. Add |
| // the break target to any TargetCollectors passed on the stack. |
| for (Target* t = target_stack_; t != stop; t = t->previous()) { |
| TargetCollector* collector = t->node()->AsTargetCollector(); |
| if (collector != NULL) collector->AddTarget(target); |
| } |
| } |
| |
| |
| Literal* Parser::NewNumberLiteral(double number) { |
| return NEW(Literal(Factory::NewNumber(number, TENURED))); |
| } |
| |
| |
| Expression* Parser::NewThrowReferenceError(Handle<String> type) { |
| return NewThrowError(Factory::MakeReferenceError_symbol(), |
| type, HandleVector<Object>(NULL, 0)); |
| } |
| |
| |
| Expression* Parser::NewThrowSyntaxError(Handle<String> type, |
| Handle<Object> first) { |
| int argc = first.is_null() ? 0 : 1; |
| Vector< Handle<Object> > arguments = HandleVector<Object>(&first, argc); |
| return NewThrowError(Factory::MakeSyntaxError_symbol(), type, arguments); |
| } |
| |
| |
| Expression* Parser::NewThrowTypeError(Handle<String> type, |
| Handle<Object> first, |
| Handle<Object> second) { |
| ASSERT(!first.is_null() && !second.is_null()); |
| Handle<Object> elements[] = { first, second }; |
| Vector< Handle<Object> > arguments = |
| HandleVector<Object>(elements, ARRAY_SIZE(elements)); |
| return NewThrowError(Factory::MakeTypeError_symbol(), type, arguments); |
| } |
| |
| |
| Expression* Parser::NewThrowError(Handle<String> constructor, |
| Handle<String> type, |
| Vector< Handle<Object> > arguments) { |
| if (is_pre_parsing_) return NULL; |
| |
| int argc = arguments.length(); |
| Handle<JSArray> array = Factory::NewJSArray(argc, TENURED); |
| ASSERT(array->IsJSArray() && array->HasFastElements()); |
| for (int i = 0; i < argc; i++) { |
| Handle<Object> element = arguments[i]; |
| if (!element.is_null()) { |
| array->SetFastElement(i, *element); |
| } |
| } |
| ZoneList<Expression*>* args = new ZoneList<Expression*>(2); |
| args->Add(new Literal(type)); |
| args->Add(new Literal(array)); |
| return new Throw(new CallRuntime(constructor, NULL, args), |
| scanner().location().beg_pos); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Regular expressions |
| |
| |
| RegExpParser::RegExpParser(FlatStringReader* in, |
| Handle<String>* error, |
| bool multiline) |
| : current_(kEndMarker), |
| has_more_(true), |
| multiline_(multiline), |
| next_pos_(0), |
| in_(in), |
| error_(error), |
| simple_(false), |
| contains_anchor_(false), |
| captures_(NULL), |
| is_scanned_for_captures_(false), |
| capture_count_(0), |
| failed_(false) { |
| Advance(1); |
| } |
| |
| |
| uc32 RegExpParser::Next() { |
| if (has_next()) { |
| return in()->Get(next_pos_); |
| } else { |
| return kEndMarker; |
| } |
| } |
| |
| |
| void RegExpParser::Advance() { |
| if (next_pos_ < in()->length()) { |
| StackLimitCheck check; |
| if (check.HasOverflowed()) { |
| ReportError(CStrVector(Top::kStackOverflowMessage)); |
| } else if (Zone::excess_allocation()) { |
| ReportError(CStrVector("Regular expression too large")); |
| } else { |
| current_ = in()->Get(next_pos_); |
| next_pos_++; |
| } |
| } else { |
| current_ = kEndMarker; |
| has_more_ = false; |
| } |
| } |
| |
| |
| void RegExpParser::Reset(int pos) { |
| next_pos_ = pos; |
| Advance(); |
| } |
| |
| |
| void RegExpParser::Advance(int dist) { |
| for (int i = 0; i < dist; i++) |
| Advance(); |
| } |
| |
| |
| bool RegExpParser::simple() { |
| return simple_; |
| } |
| |
| RegExpTree* RegExpParser::ReportError(Vector<const char> message) { |
| failed_ = true; |
| *error_ = Factory::NewStringFromAscii(message, NOT_TENURED); |
| // Zip to the end to make sure the no more input is read. |
| current_ = kEndMarker; |
| next_pos_ = in()->length(); |
| return NULL; |
| } |
| |
| |
| // Pattern :: |
| // Disjunction |
| RegExpTree* RegExpParser::ParsePattern() { |
| RegExpTree* result = ParseDisjunction(CHECK_FAILED); |
| ASSERT(!has_more()); |
| // If the result of parsing is a literal string atom, and it has the |
| // same length as the input, then the atom is identical to the input. |
| if (result->IsAtom() && result->AsAtom()->length() == in()->length()) { |
| simple_ = true; |
| } |
| return result; |
| } |
| |
| |
| // Disjunction :: |
| // Alternative |
| // Alternative | Disjunction |
| // Alternative :: |
| // [empty] |
| // Term Alternative |
| // Term :: |
| // Assertion |
| // Atom |
| // Atom Quantifier |
| RegExpTree* RegExpParser::ParseDisjunction() { |
| // Used to store current state while parsing subexpressions. |
| RegExpParserState initial_state(NULL, INITIAL, 0); |
| RegExpParserState* stored_state = &initial_state; |
| // Cache the builder in a local variable for quick access. |
| RegExpBuilder* builder = initial_state.builder(); |
| while (true) { |
| switch (current()) { |
| case kEndMarker: |
| if (stored_state->IsSubexpression()) { |
| // Inside a parenthesized group when hitting end of input. |
| ReportError(CStrVector("Unterminated group") CHECK_FAILED); |
| } |
| ASSERT_EQ(INITIAL, stored_state->group_type()); |
| // Parsing completed successfully. |
| return builder->ToRegExp(); |
| case ')': { |
| if (!stored_state->IsSubexpression()) { |
| ReportError(CStrVector("Unmatched ')'") CHECK_FAILED); |
| } |
| ASSERT_NE(INITIAL, stored_state->group_type()); |
| |
| Advance(); |
| // End disjunction parsing and convert builder content to new single |
| // regexp atom. |
| RegExpTree* body = builder->ToRegExp(); |
| |
| int end_capture_index = captures_started(); |
| |
| int capture_index = stored_state->capture_index(); |
| SubexpressionType type = stored_state->group_type(); |
| |
| // Restore previous state. |
| stored_state = stored_state->previous_state(); |
| builder = stored_state->builder(); |
| |
| // Build result of subexpression. |
| if (type == CAPTURE) { |
| RegExpCapture* capture = new RegExpCapture(body, capture_index); |
| captures_->at(capture_index - 1) = capture; |
| body = capture; |
| } else if (type != GROUPING) { |
| ASSERT(type == POSITIVE_LOOKAHEAD || type == NEGATIVE_LOOKAHEAD); |
| bool is_positive = (type == POSITIVE_LOOKAHEAD); |
| body = new RegExpLookahead(body, |
| is_positive, |
| end_capture_index - capture_index, |
| capture_index); |
| } |
| builder->AddAtom(body); |
| break; |
| } |
| case '|': { |
| Advance(); |
| builder->NewAlternative(); |
| continue; |
| } |
| case '*': |
| case '+': |
| case '?': |
| return ReportError(CStrVector("Nothing to repeat")); |
| case '^': { |
| Advance(); |
| if (multiline_) { |
| builder->AddAssertion( |
| new RegExpAssertion(RegExpAssertion::START_OF_LINE)); |
| } else { |
| builder->AddAssertion( |
| new RegExpAssertion(RegExpAssertion::START_OF_INPUT)); |
| set_contains_anchor(); |
| } |
| continue; |
| } |
| case '$': { |
| Advance(); |
| RegExpAssertion::Type type = |
| multiline_ ? RegExpAssertion::END_OF_LINE : |
| RegExpAssertion::END_OF_INPUT; |
| builder->AddAssertion(new RegExpAssertion(type)); |
| continue; |
| } |
| case '.': { |
| Advance(); |
| // everything except \x0a, \x0d, \u2028 and \u2029 |
| ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| CharacterRange::AddClassEscape('.', ranges); |
| RegExpTree* atom = new RegExpCharacterClass(ranges, false); |
| builder->AddAtom(atom); |
| break; |
| } |
| case '(': { |
| SubexpressionType type = CAPTURE; |
| Advance(); |
| if (current() == '?') { |
| switch (Next()) { |
| case ':': |
| type = GROUPING; |
| break; |
| case '=': |
| type = POSITIVE_LOOKAHEAD; |
| break; |
| case '!': |
| type = NEGATIVE_LOOKAHEAD; |
| break; |
| default: |
| ReportError(CStrVector("Invalid group") CHECK_FAILED); |
| break; |
| } |
| Advance(2); |
| } else { |
| if (captures_ == NULL) { |
| captures_ = new ZoneList<RegExpCapture*>(2); |
| } |
| if (captures_started() >= kMaxCaptures) { |
| ReportError(CStrVector("Too many captures") CHECK_FAILED); |
| } |
| captures_->Add(NULL); |
| } |
| // Store current state and begin new disjunction parsing. |
| stored_state = new RegExpParserState(stored_state, |
| type, |
| captures_started()); |
| builder = stored_state->builder(); |
| break; |
| } |
| case '[': { |
| RegExpTree* atom = ParseCharacterClass(CHECK_FAILED); |
| builder->AddAtom(atom); |
| break; |
| } |
| // Atom :: |
| // \ AtomEscape |
| case '\\': |
| switch (Next()) { |
| case kEndMarker: |
| return ReportError(CStrVector("\\ at end of pattern")); |
| case 'b': |
| Advance(2); |
| builder->AddAssertion( |
| new RegExpAssertion(RegExpAssertion::BOUNDARY)); |
| continue; |
| case 'B': |
| Advance(2); |
| builder->AddAssertion( |
| new RegExpAssertion(RegExpAssertion::NON_BOUNDARY)); |
| continue; |
| // AtomEscape :: |
| // CharacterClassEscape |
| // |
| // CharacterClassEscape :: one of |
| // d D s S w W |
| case 'd': case 'D': case 's': case 'S': case 'w': case 'W': { |
| uc32 c = Next(); |
| Advance(2); |
| ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| CharacterRange::AddClassEscape(c, ranges); |
| RegExpTree* atom = new RegExpCharacterClass(ranges, false); |
| builder->AddAtom(atom); |
| break; |
| } |
| case '1': case '2': case '3': case '4': case '5': case '6': |
| case '7': case '8': case '9': { |
| int index = 0; |
| if (ParseBackReferenceIndex(&index)) { |
| RegExpCapture* capture = NULL; |
| if (captures_ != NULL && index <= captures_->length()) { |
| capture = captures_->at(index - 1); |
| } |
| if (capture == NULL) { |
| builder->AddEmpty(); |
| break; |
| } |
| RegExpTree* atom = new RegExpBackReference(capture); |
| builder->AddAtom(atom); |
| break; |
| } |
| uc32 first_digit = Next(); |
| if (first_digit == '8' || first_digit == '9') { |
| // Treat as identity escape |
| builder->AddCharacter(first_digit); |
| Advance(2); |
| break; |
| } |
| } |
| // FALLTHROUGH |
| case '0': { |
| Advance(); |
| uc32 octal = ParseOctalLiteral(); |
| builder->AddCharacter(octal); |
| break; |
| } |
| // ControlEscape :: one of |
| // f n r t v |
| case 'f': |
| Advance(2); |
| builder->AddCharacter('\f'); |
| break; |
| case 'n': |
| Advance(2); |
| builder->AddCharacter('\n'); |
| break; |
| case 'r': |
| Advance(2); |
| builder->AddCharacter('\r'); |
| break; |
| case 't': |
| Advance(2); |
| builder->AddCharacter('\t'); |
| break; |
| case 'v': |
| Advance(2); |
| builder->AddCharacter('\v'); |
| break; |
| case 'c': { |
| Advance(2); |
| uc32 control = ParseControlLetterEscape(); |
| builder->AddCharacter(control); |
| break; |
| } |
| case 'x': { |
| Advance(2); |
| uc32 value; |
| if (ParseHexEscape(2, &value)) { |
| builder->AddCharacter(value); |
| } else { |
| builder->AddCharacter('x'); |
| } |
| break; |
| } |
| case 'u': { |
| Advance(2); |
| uc32 value; |
| if (ParseHexEscape(4, &value)) { |
| builder->AddCharacter(value); |
| } else { |
| builder->AddCharacter('u'); |
| } |
| break; |
| } |
| default: |
| // Identity escape. |
| builder->AddCharacter(Next()); |
| Advance(2); |
| break; |
| } |
| break; |
| case '{': { |
| int dummy; |
| if (ParseIntervalQuantifier(&dummy, &dummy)) { |
| ReportError(CStrVector("Nothing to repeat") CHECK_FAILED); |
| } |
| // fallthrough |
| } |
| default: |
| builder->AddCharacter(current()); |
| Advance(); |
| break; |
| } // end switch(current()) |
| |
| int min; |
| int max; |
| switch (current()) { |
| // QuantifierPrefix :: |
| // * |
| // + |
| // ? |
| // { |
| case '*': |
| min = 0; |
| max = RegExpTree::kInfinity; |
| Advance(); |
| break; |
| case '+': |
| min = 1; |
| max = RegExpTree::kInfinity; |
| Advance(); |
| break; |
| case '?': |
| min = 0; |
| max = 1; |
| Advance(); |
| break; |
| case '{': |
| if (ParseIntervalQuantifier(&min, &max)) { |
| if (max < min) { |
| ReportError(CStrVector("numbers out of order in {} quantifier.") |
| CHECK_FAILED); |
| } |
| break; |
| } else { |
| continue; |
| } |
| default: |
| continue; |
| } |
| bool is_greedy = true; |
| if (current() == '?') { |
| is_greedy = false; |
| Advance(); |
| } |
| builder->AddQuantifierToAtom(min, max, is_greedy); |
| } |
| } |
| |
| class SourceCharacter { |
| public: |
| static bool Is(uc32 c) { |
| switch (c) { |
| // case ']': case '}': |
| // In spidermonkey and jsc these are treated as source characters |
| // so we do too. |
| case '^': case '$': case '\\': case '.': case '*': case '+': |
| case '?': case '(': case ')': case '[': case '{': case '|': |
| case RegExpParser::kEndMarker: |
| return false; |
| default: |
| return true; |
| } |
| } |
| }; |
| |
| |
| static unibrow::Predicate<SourceCharacter> source_character; |
| |
| |
| static inline bool IsSourceCharacter(uc32 c) { |
| return source_character.get(c); |
| } |
| |
| #ifdef DEBUG |
| // Currently only used in an ASSERT. |
| static bool IsSpecialClassEscape(uc32 c) { |
| switch (c) { |
| case 'd': case 'D': |
| case 's': case 'S': |
| case 'w': case 'W': |
| return true; |
| default: |
| return false; |
| } |
| } |
| #endif |
| |
| |
| // In order to know whether an escape is a backreference or not we have to scan |
| // the entire regexp and find the number of capturing parentheses. However we |
| // don't want to scan the regexp twice unless it is necessary. This mini-parser |
| // is called when needed. It can see the difference between capturing and |
| // noncapturing parentheses and can skip character classes and backslash-escaped |
| // characters. |
| void RegExpParser::ScanForCaptures() { |
| // Start with captures started previous to current position |
| int capture_count = captures_started(); |
| // Add count of captures after this position. |
| int n; |
| while ((n = current()) != kEndMarker) { |
| Advance(); |
| switch (n) { |
| case '\\': |
| Advance(); |
| break; |
| case '[': { |
| int c; |
| while ((c = current()) != kEndMarker) { |
| Advance(); |
| if (c == '\\') { |
| Advance(); |
| } else { |
| if (c == ']') break; |
| } |
| } |
| break; |
| } |
| case '(': |
| if (current() != '?') capture_count++; |
| break; |
| } |
| } |
| capture_count_ = capture_count; |
| is_scanned_for_captures_ = true; |
| } |
| |
| |
| bool RegExpParser::ParseBackReferenceIndex(int* index_out) { |
| ASSERT_EQ('\\', current()); |
| ASSERT('1' <= Next() && Next() <= '9'); |
| // Try to parse a decimal literal that is no greater than the total number |
| // of left capturing parentheses in the input. |
| int start = position(); |
| int value = Next() - '0'; |
| Advance(2); |
| while (true) { |
| uc32 c = current(); |
| if (IsDecimalDigit(c)) { |
| value = 10 * value + (c - '0'); |
| if (value > kMaxCaptures) { |
| Reset(start); |
| return false; |
| } |
| Advance(); |
| } else { |
| break; |
| } |
| } |
| if (value > captures_started()) { |
| if (!is_scanned_for_captures_) { |
| int saved_position = position(); |
| ScanForCaptures(); |
| Reset(saved_position); |
| } |
| if (value > capture_count_) { |
| Reset(start); |
| return false; |
| } |
| } |
| *index_out = value; |
| return true; |
| } |
| |
| |
| // QuantifierPrefix :: |
| // { DecimalDigits } |
| // { DecimalDigits , } |
| // { DecimalDigits , DecimalDigits } |
| // |
| // Returns true if parsing succeeds, and set the min_out and max_out |
| // values. Values are truncated to RegExpTree::kInfinity if they overflow. |
| bool RegExpParser::ParseIntervalQuantifier(int* min_out, int* max_out) { |
| ASSERT_EQ(current(), '{'); |
| int start = position(); |
| Advance(); |
| int min = 0; |
| if (!IsDecimalDigit(current())) { |
| Reset(start); |
| return false; |
| } |
| while (IsDecimalDigit(current())) { |
| int next = current() - '0'; |
| if (min > (RegExpTree::kInfinity - next) / 10) { |
| // Overflow. Skip past remaining decimal digits and return -1. |
| do { |
| Advance(); |
| } while (IsDecimalDigit(current())); |
| min = RegExpTree::kInfinity; |
| break; |
| } |
| min = 10 * min + next; |
| Advance(); |
| } |
| int max = 0; |
| if (current() == '}') { |
| max = min; |
| Advance(); |
| } else if (current() == ',') { |
| Advance(); |
| if (current() == '}') { |
| max = RegExpTree::kInfinity; |
| Advance(); |
| } else { |
| while (IsDecimalDigit(current())) { |
| int next = current() - '0'; |
| if (max > (RegExpTree::kInfinity - next) / 10) { |
| do { |
| Advance(); |
| } while (IsDecimalDigit(current())); |
| max = RegExpTree::kInfinity; |
| break; |
| } |
| max = 10 * max + next; |
| Advance(); |
| } |
| if (current() != '}') { |
| Reset(start); |
| return false; |
| } |
| Advance(); |
| } |
| } else { |
| Reset(start); |
| return false; |
| } |
| *min_out = min; |
| *max_out = max; |
| return true; |
| } |
| |
| |
| // Upper and lower case letters differ by one bit. |
| STATIC_CHECK(('a' ^ 'A') == 0x20); |
| |
| uc32 RegExpParser::ParseControlLetterEscape() { |
| if (!has_more()) |
| return 'c'; |
| uc32 letter = current() & ~(0x20); // Collapse upper and lower case letters. |
| if (letter < 'A' || 'Z' < letter) { |
| // Non-spec error-correction: "\c" followed by non-control letter is |
| // interpreted as an IdentityEscape of 'c'. |
| return 'c'; |
| } |
| Advance(); |
| return letter & 0x1f; // Remainder modulo 32, per specification. |
| } |
| |
| |
| uc32 RegExpParser::ParseOctalLiteral() { |
| ASSERT('0' <= current() && current() <= '7'); |
| // For compatibility with some other browsers (not all), we parse |
| // up to three octal digits with a value below 256. |
| uc32 value = current() - '0'; |
| Advance(); |
| if ('0' <= current() && current() <= '7') { |
| value = value * 8 + current() - '0'; |
| Advance(); |
| if (value < 32 && '0' <= current() && current() <= '7') { |
| value = value * 8 + current() - '0'; |
| Advance(); |
| } |
| } |
| return value; |
| } |
| |
| |
| bool RegExpParser::ParseHexEscape(int length, uc32 *value) { |
| int start = position(); |
| uc32 val = 0; |
| bool done = false; |
| for (int i = 0; !done; i++) { |
| uc32 c = current(); |
| int d = HexValue(c); |
| if (d < 0) { |
| Reset(start); |
| return false; |
| } |
| val = val * 16 + d; |
| Advance(); |
| if (i == length - 1) { |
| done = true; |
| } |
| } |
| *value = val; |
| return true; |
| } |
| |
| |
| uc32 RegExpParser::ParseClassCharacterEscape() { |
| ASSERT(current() == '\\'); |
| ASSERT(has_next() && !IsSpecialClassEscape(Next())); |
| Advance(); |
| switch (current()) { |
| case 'b': |
| Advance(); |
| return '\b'; |
| // ControlEscape :: one of |
| // f n r t v |
| case 'f': |
| Advance(); |
| return '\f'; |
| case 'n': |
| Advance(); |
| return '\n'; |
| case 'r': |
| Advance(); |
| return '\r'; |
| case 't': |
| Advance(); |
| return '\t'; |
| case 'v': |
| Advance(); |
| return '\v'; |
| case 'c': |
| Advance(); |
| return ParseControlLetterEscape(); |
| case '0': case '1': case '2': case '3': case '4': case '5': |
| case '6': case '7': |
| // For compatibility, we interpret a decimal escape that isn't |
| // a back reference (and therefore either \0 or not valid according |
| // to the specification) as a 1..3 digit octal character code. |
| return ParseOctalLiteral(); |
| case 'x': { |
| Advance(); |
| uc32 value; |
| if (ParseHexEscape(2, &value)) { |
| return value; |
| } |
| // If \x is not followed by a two-digit hexadecimal, treat it |
| // as an identity escape. |
| return 'x'; |
| } |
| case 'u': { |
| Advance(); |
| uc32 value; |
| if (ParseHexEscape(4, &value)) { |
| return value; |
| } |
| // If \u is not followed by a four-digit hexadecimal, treat it |
| // as an identity escape. |
| return 'u'; |
| } |
| default: { |
| // Extended identity escape. We accept any character that hasn't |
| // been matched by a more specific case, not just the subset required |
| // by the ECMAScript specification. |
| uc32 result = current(); |
| Advance(); |
| return result; |
| } |
| } |
| return 0; |
| } |
| |
| |
| CharacterRange RegExpParser::ParseClassAtom(uc16* char_class) { |
| ASSERT_EQ(0, *char_class); |
| uc32 first = current(); |
| if (first == '\\') { |
| switch (Next()) { |
| case 'w': case 'W': case 'd': case 'D': case 's': case 'S': { |
| *char_class = Next(); |
| Advance(2); |
| return CharacterRange::Singleton(0); // Return dummy value. |
| } |
| case kEndMarker: |
| return ReportError(CStrVector("\\ at end of pattern")); |
| default: |
| uc32 c = ParseClassCharacterEscape(CHECK_FAILED); |
| return CharacterRange::Singleton(c); |
| } |
| } else { |
| Advance(); |
| return CharacterRange::Singleton(first); |
| } |
| } |
| |
| |
| RegExpTree* RegExpParser::ParseCharacterClass() { |
| static const char* kUnterminated = "Unterminated character class"; |
| static const char* kRangeOutOfOrder = "Range out of order in character class"; |
| |
| ASSERT_EQ(current(), '['); |
| Advance(); |
| bool is_negated = false; |
| if (current() == '^') { |
| is_negated = true; |
| Advance(); |
| } |
| ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2); |
| while (has_more() && current() != ']') { |
| uc16 char_class = 0; |
| CharacterRange first = ParseClassAtom(&char_class CHECK_FAILED); |
| if (char_class) { |
| CharacterRange::AddClassEscape(char_class, ranges); |
| continue; |
| } |
| if (current() == '-') { |
| Advance(); |
| if (current() == kEndMarker) { |
| // If we reach the end we break out of the loop and let the |
| // following code report an error. |
| break; |
| } else if (current() == ']') { |
| ranges->Add(first); |
| ranges->Add(CharacterRange::Singleton('-')); |
| break; |
| } |
| CharacterRange next = ParseClassAtom(&char_class CHECK_FAILED); |
| if (char_class) { |
| ranges->Add(first); |
| ranges->Add(CharacterRange::Singleton('-')); |
| CharacterRange::AddClassEscape(char_class, ranges); |
| continue; |
| } |
| if (first.from() > next.to()) { |
| return ReportError(CStrVector(kRangeOutOfOrder) CHECK_FAILED); |
| } |
| ranges->Add(CharacterRange::Range(first.from(), next.to())); |
| } else { |
| ranges->Add(first); |
| } |
| } |
| if (!has_more()) { |
| return ReportError(CStrVector(kUnterminated) CHECK_FAILED); |
| } |
| Advance(); |
| if (ranges->length() == 0) { |
| ranges->Add(CharacterRange::Everything()); |
| is_negated = !is_negated; |
| } |
| return new RegExpCharacterClass(ranges, is_negated); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // The Parser interface. |
| |
| // MakeAST() is just a wrapper for the corresponding Parser calls |
| // so we don't have to expose the entire Parser class in the .h file. |
| |
| static bool always_allow_natives_syntax = false; |
| |
| |
| ParserMessage::~ParserMessage() { |
| for (int i = 0; i < args().length(); i++) |
| DeleteArray(args()[i]); |
| DeleteArray(args().start()); |
| } |
| |
| |
| ScriptDataImpl::~ScriptDataImpl() { |
| store_.Dispose(); |
| } |
| |
| |
| int ScriptDataImpl::Length() { |
| return store_.length(); |
| } |
| |
| |
| unsigned* ScriptDataImpl::Data() { |
| return store_.start(); |
| } |
| |
| |
| ScriptDataImpl* PreParse(Handle<String> source, |
| unibrow::CharacterStream* stream, |
| v8::Extension* extension) { |
| Handle<Script> no_script; |
| bool allow_natives_syntax = |
| always_allow_natives_syntax || |
| FLAG_allow_natives_syntax || |
| Bootstrapper::IsActive(); |
| PreParser parser(no_script, allow_natives_syntax, extension); |
| if (!parser.PreParseProgram(source, stream)) return NULL; |
| // The list owns the backing store so we need to clone the vector. |
| // That way, the result will be exactly the right size rather than |
| // the expected 50% too large. |
| Vector<unsigned> store = parser.recorder()->store()->ToVector().Clone(); |
| return new ScriptDataImpl(store); |
| } |
| |
| |
| bool ParseRegExp(FlatStringReader* input, |
| bool multiline, |
| RegExpCompileData* result) { |
| ASSERT(result != NULL); |
| RegExpParser parser(input, &result->error, multiline); |
| RegExpTree* tree = parser.ParsePattern(); |
| if (parser.failed()) { |
| ASSERT(tree == NULL); |
| ASSERT(!result->error.is_null()); |
| } else { |
| ASSERT(tree != NULL); |
| ASSERT(result->error.is_null()); |
| result->tree = tree; |
| int capture_count = parser.captures_started(); |
| result->simple = tree->IsAtom() && parser.simple() && capture_count == 0; |
| result->contains_anchor = parser.contains_anchor(); |
| result->capture_count = capture_count; |
| } |
| return !parser.failed(); |
| } |
| |
| |
| FunctionLiteral* MakeAST(bool compile_in_global_context, |
| Handle<Script> script, |
| v8::Extension* extension, |
| ScriptDataImpl* pre_data) { |
| bool allow_natives_syntax = |
| always_allow_natives_syntax || |
| FLAG_allow_natives_syntax || |
| Bootstrapper::IsActive(); |
| AstBuildingParser parser(script, allow_natives_syntax, extension, pre_data); |
| if (pre_data != NULL && pre_data->has_error()) { |
| Scanner::Location loc = pre_data->MessageLocation(); |
| const char* message = pre_data->BuildMessage(); |
| Vector<const char*> args = pre_data->BuildArgs(); |
| parser.ReportMessageAt(loc, message, args); |
| DeleteArray(message); |
| for (int i = 0; i < args.length(); i++) |
| DeleteArray(args[i]); |
| DeleteArray(args.start()); |
| return NULL; |
| } |
| Handle<String> source = Handle<String>(String::cast(script->source())); |
| SafeStringInputBuffer input(source.location()); |
| FunctionLiteral* result = parser.ParseProgram(source, |
| &input, compile_in_global_context); |
| return result; |
| } |
| |
| |
| FunctionLiteral* MakeLazyAST(Handle<Script> script, |
| Handle<String> name, |
| int start_position, |
| int end_position, |
| bool is_expression) { |
| bool allow_natives_syntax_before = always_allow_natives_syntax; |
| always_allow_natives_syntax = true; |
| AstBuildingParser parser(script, true, NULL, NULL); // always allow |
| always_allow_natives_syntax = allow_natives_syntax_before; |
| // Parse the function by pulling the function source from the script source. |
| Handle<String> script_source(String::cast(script->source())); |
| FunctionLiteral* result = |
| parser.ParseLazy(SubString(script_source, start_position, end_position), |
| name, |
| start_position, |
| is_expression); |
| return result; |
| } |
| |
| |
| #undef NEW |
| |
| |
| } } // namespace v8::internal |