1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_PARSER_H_ 29 #define V8_PARSER_H_ 30 31 #include "scanner.h" 32 #include "allocation.h" 33 34 namespace v8 { 35 namespace internal { 36 37 38 class ParserMessage : public Malloced { 39 public: 40 ParserMessage(Scanner::Location loc, const char* message, 41 Vector<const char*> args) 42 : loc_(loc), 43 message_(message), 44 args_(args) { } 45 ~ParserMessage(); 46 Scanner::Location location() { return loc_; } 47 const char* message() { return message_; } 48 Vector<const char*> args() { return args_; } 49 private: 50 Scanner::Location loc_; 51 const char* message_; 52 Vector<const char*> args_; 53 }; 54 55 56 class FunctionEntry BASE_EMBEDDED { 57 public: 58 explicit FunctionEntry(Vector<unsigned> backing) : backing_(backing) { } 59 FunctionEntry() : backing_(Vector<unsigned>::empty()) { } 60 61 int start_pos() { return backing_[kStartPosOffset]; } 62 void set_start_pos(int value) { backing_[kStartPosOffset] = value; } 63 64 int end_pos() { return backing_[kEndPosOffset]; } 65 void set_end_pos(int value) { backing_[kEndPosOffset] = value; } 66 67 int literal_count() { return backing_[kLiteralCountOffset]; } 68 void set_literal_count(int value) { backing_[kLiteralCountOffset] = value; } 69 70 int property_count() { return backing_[kPropertyCountOffset]; } 71 void set_property_count(int value) { backing_[kPropertyCountOffset] = value; } 72 73 bool is_valid() { return backing_.length() > 0; } 74 75 static const int kSize = 4; 76 77 private: 78 Vector<unsigned> backing_; 79 static const int kStartPosOffset = 0; 80 static const int kEndPosOffset = 1; 81 static const int kLiteralCountOffset = 2; 82 static const int kPropertyCountOffset = 3; 83 }; 84 85 86 class ScriptDataImpl : public ScriptData { 87 public: 88 explicit ScriptDataImpl(Vector<unsigned> store) 89 : store_(store), 90 last_entry_(0) { } 91 virtual ~ScriptDataImpl(); 92 virtual int Length(); 93 virtual unsigned* Data(); 94 virtual bool HasError(); 95 FunctionEntry GetFunctionEnd(int start); 96 bool SanityCheck(); 97 98 Scanner::Location MessageLocation(); 99 const char* BuildMessage(); 100 Vector<const char*> BuildArgs(); 101 102 bool has_error() { return store_[kHasErrorOffset]; } 103 unsigned magic() { return store_[kMagicOffset]; } 104 unsigned version() { return store_[kVersionOffset]; } 105 106 static const unsigned kMagicNumber = 0xBadDead; 107 static const unsigned kCurrentVersion = 1; 108 109 static const unsigned kMagicOffset = 0; 110 static const unsigned kVersionOffset = 1; 111 static const unsigned kHasErrorOffset = 2; 112 static const unsigned kSizeOffset = 3; 113 static const unsigned kHeaderSize = 4; 114 115 private: 116 unsigned Read(int position); 117 unsigned* ReadAddress(int position); 118 int EntryCount(); 119 FunctionEntry nth(int n); 120 121 Vector<unsigned> store_; 122 123 // The last entry returned. This is used to make lookup faster: 124 // the next entry to return is typically the next entry so lookup 125 // will usually be much faster if we start from the last entry. 126 int last_entry_; 127 }; 128 129 130 // The parser: Takes a script and and context information, and builds a 131 // FunctionLiteral AST node. Returns NULL and deallocates any allocated 132 // AST nodes if parsing failed. 133 FunctionLiteral* MakeAST(bool compile_in_global_context, 134 Handle<Script> script, 135 v8::Extension* extension, 136 ScriptDataImpl* pre_data, 137 bool is_json = false); 138 139 140 ScriptDataImpl* PreParse(Handle<String> source, 141 unibrow::CharacterStream* stream, 142 v8::Extension* extension); 143 144 145 bool ParseRegExp(FlatStringReader* input, 146 bool multiline, 147 RegExpCompileData* result); 148 149 150 // Support for doing lazy compilation. The script is the script containing full 151 // source of the script where the function is declared. The start_position and 152 // end_position specifies the part of the script source which has the source 153 // for the function declaration in the form: 154 // 155 // (<formal parameters>) { <function body> } 156 // 157 // without any function keyword or name. 158 // 159 FunctionLiteral* MakeLazyAST(Handle<Script> script, 160 Handle<String> name, 161 int start_position, 162 int end_position, 163 bool is_expression); 164 165 166 // Support for handling complex values (array and object literals) that 167 // can be fully handled at compile time. 168 class CompileTimeValue: public AllStatic { 169 public: 170 enum Type { 171 OBJECT_LITERAL, 172 ARRAY_LITERAL 173 }; 174 175 static bool IsCompileTimeValue(Expression* expression); 176 177 // Get the value as a compile time value. 178 static Handle<FixedArray> GetValue(Expression* expression); 179 180 // Get the type of a compile time value returned by GetValue(). 181 static Type GetType(Handle<FixedArray> value); 182 183 // Get the elements array of a compile time value returned by GetValue(). 184 static Handle<FixedArray> GetElements(Handle<FixedArray> value); 185 186 private: 187 static const int kTypeSlot = 0; 188 static const int kElementsSlot = 1; 189 190 DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue); 191 }; 192 193 194 } } // namespace v8::internal 195 196 #endif // V8_PARSER_H_ 197
