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.
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.
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,
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 int length() const OVERRIDE {
69 return literal_bytes_.length();
70 return literal_bytes_.length() / 2;
73 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 // For storing AstRawStrings in a hash map.
92 uint32_t hash() const {
95 static bool Compare(void* a, void* b);
97 bool operator==(const AstRawString& rhs) const;
100 friend class AstValueFactory;
101 friend class AstRawStringInternalizationKey;
103 AstRawString(bool is_one_byte, const Vector<const byte>& literal_bytes,
105 : is_one_byte_(is_one_byte), literal_bytes_(literal_bytes), hash_(hash) {}
108 : is_one_byte_(true),
113 // Points to memory owned by Zone.
114 Vector<const byte> literal_bytes_;
119 class AstConsString : public AstString {
121 AstConsString(const AstString* left, const AstString* right)
125 int length() const OVERRIDE { return left_->length() + right_->length(); }
127 void Internalize(Isolate* isolate) OVERRIDE;
130 friend class AstValueFactory;
132 const AstString* left_;
133 const AstString* right_;
137 // AstValue is either a string, a number, a string array, a boolean, or a
138 // special value (null, undefined, the hole).
139 class AstValue : public ZoneObject {
141 bool IsString() const {
142 return type_ == STRING;
145 bool IsNumber() const {
146 return type_ == NUMBER || type_ == SMI;
149 const AstRawString* AsString() const {
156 double AsNumber() const {
165 bool EqualsString(const AstRawString* string) const {
166 return type_ == STRING && string_ == string;
169 bool IsPropertyName() const;
171 bool BooleanValue() const;
173 void Internalize(Isolate* isolate);
175 // Can be called after Internalize has been called.
176 V8_INLINE Handle<Object> value() const {
177 if (type_ == STRING) {
178 return string_->string();
180 DCHECK(!value_.is_null());
185 friend class AstValueFactory;
198 explicit AstValue(const AstRawString* s) : type_(STRING) { string_ = s; }
200 explicit AstValue(const char* name) : type_(SYMBOL) { symbol_name_ = name; }
202 explicit AstValue(double n) : type_(NUMBER) { number_ = n; }
204 AstValue(Type t, int i) : type_(t) {
205 DCHECK(type_ == SMI);
209 explicit AstValue(bool b) : type_(BOOLEAN) { bool_ = b; }
211 explicit AstValue(Type t) : type_(t) {
212 DCHECK(t == NULL_TYPE || t == UNDEFINED || t == THE_HOLE);
217 // Uninternalized value.
219 const AstRawString* string_;
223 ZoneList<const AstRawString*>* strings_;
224 const char* symbol_name_;
227 // Internalized value (empty before internalized).
228 Handle<Object> value_;
232 // For generating constants.
233 #define STRING_CONSTANTS(F) \
234 F(anonymous_function, "(anonymous function)") \
235 F(arguments, "arguments") \
236 F(constructor, "constructor") \
237 F(default, "default") \
241 F(dot_generator, ".generator") \
242 F(dot_generator_object, ".generator_object") \
243 F(dot_iterator, ".iterator") \
244 F(dot_module, ".module") \
245 F(dot_result, ".result") \
248 F(get_template_callsite, "GetTemplateCallSite") \
249 F(initialize_const_global, "initializeConstGlobal") \
250 F(initialize_var_global, "initializeVarGlobal") \
251 F(is_construct_call, "_IsConstructCall") \
252 F(is_spec_object, "_IsSpecObject") \
254 F(make_reference_error, "MakeReferenceErrorEmbedded") \
255 F(make_syntax_error, "MakeSyntaxErrorEmbedded") \
256 F(make_type_error, "MakeTypeErrorEmbedded") \
257 F(native, "native") \
258 F(new_target, "new.target") \
260 F(proto, "__proto__") \
261 F(prototype, "prototype") \
263 F(throw_iterator_result_not_an_object, "ThrowIteratorResultNotAnObject") \
264 F(to_string, "ToString") \
265 F(use_asm, "use asm") \
266 F(use_strong, "use strong") \
267 F(use_strict, "use strict") \
270 #define OTHER_CONSTANTS(F) \
277 class AstValueFactory {
279 AstValueFactory(Zone* zone, uint32_t hash_seed)
280 : string_table_(AstRawString::Compare),
283 hash_seed_(hash_seed) {
284 #define F(name, str) name##_string_ = NULL;
287 #define F(name) name##_ = NULL;
292 Zone* zone() const { return zone_; }
294 const AstRawString* GetOneByteString(Vector<const uint8_t> literal) {
295 return GetOneByteStringInternal(literal);
297 const AstRawString* GetOneByteString(const char* string) {
298 return GetOneByteString(Vector<const uint8_t>(
299 reinterpret_cast<const uint8_t*>(string), StrLength(string)));
301 const AstRawString* GetTwoByteString(Vector<const uint16_t> literal) {
302 return GetTwoByteStringInternal(literal);
304 const AstRawString* GetString(Handle<String> literal);
305 const AstConsString* NewConsString(const AstString* left,
306 const AstString* right);
308 void Internalize(Isolate* isolate);
309 bool IsInternalized() {
310 return isolate_ != NULL;
313 #define F(name, str) \
314 const AstRawString* name##_string() { \
315 if (name##_string_ == NULL) { \
316 const char* data = str; \
317 name##_string_ = GetOneByteString( \
318 Vector<const uint8_t>(reinterpret_cast<const uint8_t*>(data), \
319 static_cast<int>(strlen(data)))); \
321 return name##_string_; \
326 const AstValue* NewString(const AstRawString* string);
327 // A JavaScript symbol (ECMA-262 edition 6).
328 const AstValue* NewSymbol(const char* name);
329 const AstValue* NewNumber(double number);
330 const AstValue* NewSmi(int number);
331 const AstValue* NewBoolean(bool b);
332 const AstValue* NewStringList(ZoneList<const AstRawString*>* strings);
333 const AstValue* NewNull();
334 const AstValue* NewUndefined();
335 const AstValue* NewTheHole();
338 AstRawString* GetOneByteStringInternal(Vector<const uint8_t> literal);
339 AstRawString* GetTwoByteStringInternal(Vector<const uint16_t> literal);
340 AstRawString* GetString(uint32_t hash, bool is_one_byte,
341 Vector<const byte> literal_bytes);
343 // All strings are copied here, one after another (no NULLs inbetween).
344 HashMap string_table_;
345 // For keeping track of all AstValues and AstRawStrings we've created (so that
346 // they can be internalized later).
347 List<AstValue*> values_;
348 List<AstString*> strings_;
354 #define F(name, str) const AstRawString* name##_string_;
358 #define F(name) AstValue* name##_;
362 } } // namespace v8::internal
364 #undef STRING_CONSTANTS
365 #undef OTHER_CONSTANTS
367 #endif // V8_AST_VALUE_FACTORY_H_