1 // Copyright 2014 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
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.
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13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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28 #ifndef V8_AST_VALUE_FACTORY_H_
29 #define V8_AST_VALUE_FACTORY_H_
32 #include "src/hashmap.h"
33 #include "src/utils.h"
35 // AstString, AstValue and AstValueFactory are for storing strings and values
36 // independent of the V8 heap and internalizing them later. During parsing,
37 // AstStrings and AstValues are created and stored outside the heap, in
38 // AstValueFactory. After parsing, the strings and values are internalized
39 // (moved into the V8 heap).
43 class AstString : public ZoneObject {
45 virtual ~AstString() {}
47 virtual int length() const = 0;
48 bool IsEmpty() const { return length() == 0; }
50 // Puts the string into the V8 heap.
51 virtual void Internalize(Isolate* isolate) = 0;
53 // This function can be called after internalizing.
54 V8_INLINE Handle<String> string() const {
55 DCHECK(!string_.is_null());
60 // This is null until the string is internalized.
61 Handle<String> string_;
65 class AstRawString : public AstString {
67 virtual int length() const OVERRIDE {
69 return literal_bytes_.length();
70 return literal_bytes_.length() / 2;
73 virtual void Internalize(Isolate* isolate) OVERRIDE;
75 bool AsArrayIndex(uint32_t* index) const;
77 // The string is not null-terminated, use length() to find out the length.
78 const unsigned char* raw_data() const {
79 return literal_bytes_.start();
81 bool is_one_byte() const { return is_one_byte_; }
82 bool IsOneByteEqualTo(const char* data) const;
83 uint16_t FirstCharacter() const {
85 return literal_bytes_[0];
87 reinterpret_cast<const uint16_t*>(literal_bytes_.start());
91 V8_INLINE bool IsArguments(AstValueFactory* ast_value_factory) const;
93 // For storing AstRawStrings in a hash map.
94 uint32_t hash() const {
97 static bool Compare(void* a, void* b);
99 bool operator==(const AstRawString& rhs) const;
102 friend class AstValueFactory;
103 friend class AstRawStringInternalizationKey;
105 AstRawString(bool is_one_byte, const Vector<const byte>& literal_bytes,
107 : is_one_byte_(is_one_byte), literal_bytes_(literal_bytes), hash_(hash) {}
110 : is_one_byte_(true),
115 // Points to memory owned by Zone.
116 Vector<const byte> literal_bytes_;
121 class AstConsString : public AstString {
123 AstConsString(const AstString* left, const AstString* right)
127 virtual int length() const OVERRIDE {
128 return left_->length() + right_->length();
131 virtual void Internalize(Isolate* isolate) OVERRIDE;
134 friend class AstValueFactory;
136 const AstString* left_;
137 const AstString* right_;
141 // AstValue is either a string, a number, a string array, a boolean, or a
142 // special value (null, undefined, the hole).
143 class AstValue : public ZoneObject {
145 bool IsString() const {
146 return type_ == STRING;
149 bool IsNumber() const {
150 return type_ == NUMBER || type_ == SMI;
153 const AstRawString* AsString() const {
160 double AsNumber() const {
169 bool EqualsString(const AstRawString* string) const {
170 return type_ == STRING && string_ == string;
173 bool IsPropertyName() const;
175 bool BooleanValue() const;
177 void Internalize(Isolate* isolate);
179 // Can be called after Internalize has been called.
180 V8_INLINE Handle<Object> value() const {
181 if (type_ == STRING) {
182 return string_->string();
184 DCHECK(!value_.is_null());
189 friend class AstValueFactory;
202 explicit AstValue(const AstRawString* s) : type_(STRING) { string_ = s; }
204 explicit AstValue(const char* name) : type_(SYMBOL) { symbol_name_ = name; }
206 explicit AstValue(double n) : type_(NUMBER) { number_ = n; }
208 AstValue(Type t, int i) : type_(t) {
209 DCHECK(type_ == SMI);
213 explicit AstValue(bool b) : type_(BOOLEAN) { bool_ = b; }
215 explicit AstValue(Type t) : type_(t) {
216 DCHECK(t == NULL_TYPE || t == UNDEFINED || t == THE_HOLE);
221 // Uninternalized value.
223 const AstRawString* string_;
227 ZoneList<const AstRawString*>* strings_;
228 const char* symbol_name_;
231 // Internalized value (empty before internalized).
232 Handle<Object> value_;
236 // For generating constants.
237 #define STRING_CONSTANTS(F) \
238 F(anonymous_function, "(anonymous function)") \
239 F(arguments, "arguments") \
240 F(constructor, "constructor") \
244 F(dot_generator, ".generator") \
245 F(dot_generator_object, ".generator_object") \
246 F(dot_iterator, ".iterator") \
247 F(dot_module, ".module") \
248 F(dot_result, ".result") \
251 F(initialize_const_global, "initializeConstGlobal") \
252 F(initialize_var_global, "initializeVarGlobal") \
253 F(make_reference_error, "MakeReferenceErrorEmbedded") \
254 F(make_syntax_error, "MakeSyntaxErrorEmbedded") \
255 F(make_type_error, "MakeTypeErrorEmbedded") \
256 F(module, "module") \
257 F(native, "native") \
259 F(proto, "__proto__") \
260 F(prototype, "prototype") \
262 F(use_asm, "use asm") \
263 F(use_strict, "use strict") \
266 #define OTHER_CONSTANTS(F) \
273 class AstValueFactory {
275 AstValueFactory(Zone* zone, uint32_t hash_seed)
276 : string_table_(AstRawString::Compare),
279 hash_seed_(hash_seed) {
280 #define F(name, str) name##_string_ = NULL;
283 #define F(name) name##_ = NULL;
288 Zone* zone() const { return zone_; }
290 const AstRawString* GetOneByteString(Vector<const uint8_t> literal);
291 const AstRawString* GetOneByteString(const char* string) {
292 return GetOneByteString(Vector<const uint8_t>(
293 reinterpret_cast<const uint8_t*>(string), StrLength(string)));
295 const AstRawString* GetTwoByteString(Vector<const uint16_t> literal);
296 const AstRawString* GetString(Handle<String> literal);
297 const AstConsString* NewConsString(const AstString* left,
298 const AstString* right);
300 void Internalize(Isolate* isolate);
301 bool IsInternalized() {
302 return isolate_ != NULL;
305 #define F(name, str) \
306 const AstRawString* name##_string() { \
307 if (name##_string_ == NULL) { \
308 const char* data = str; \
309 name##_string_ = GetOneByteString( \
310 Vector<const uint8_t>(reinterpret_cast<const uint8_t*>(data), \
311 static_cast<int>(strlen(data)))); \
313 return name##_string_; \
318 const AstValue* NewString(const AstRawString* string);
319 // A JavaScript symbol (ECMA-262 edition 6).
320 const AstValue* NewSymbol(const char* name);
321 const AstValue* NewNumber(double number);
322 const AstValue* NewSmi(int number);
323 const AstValue* NewBoolean(bool b);
324 const AstValue* NewStringList(ZoneList<const AstRawString*>* strings);
325 const AstValue* NewNull();
326 const AstValue* NewUndefined();
327 const AstValue* NewTheHole();
330 const AstRawString* GetString(uint32_t hash, bool is_one_byte,
331 Vector<const byte> literal_bytes);
333 // All strings are copied here, one after another (no NULLs inbetween).
334 HashMap string_table_;
335 // For keeping track of all AstValues and AstRawStrings we've created (so that
336 // they can be internalized later).
337 List<AstValue*> values_;
338 List<AstString*> strings_;
344 #define F(name, str) const AstRawString* name##_string_;
348 #define F(name) AstValue* name##_;
354 bool AstRawString::IsArguments(AstValueFactory* ast_value_factory) const {
355 return ast_value_factory->arguments_string() == this;
357 } } // namespace v8::internal
359 #undef STRING_CONSTANTS
360 #undef OTHER_CONSTANTS
362 #endif // V8_AST_VALUE_FACTORY_H_