| // Copyright 2014 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. |
| |
| #ifndef V8_AST_VALUE_FACTORY_H_ |
| #define V8_AST_VALUE_FACTORY_H_ |
| |
| #include "src/api.h" |
| #include "src/hashmap.h" |
| #include "src/utils.h" |
| |
| // AstString, AstValue and AstValueFactory are for storing strings and values |
| // independent of the V8 heap and internalizing them later. During parsing, |
| // AstStrings and AstValues are created and stored outside the heap, in |
| // AstValueFactory. After parsing, the strings and values are internalized |
| // (moved into the V8 heap). |
| namespace v8 { |
| namespace internal { |
| |
| class AstString : public ZoneObject { |
| public: |
| virtual ~AstString() {} |
| |
| virtual int length() const = 0; |
| bool IsEmpty() const { return length() == 0; } |
| |
| // Puts the string into the V8 heap. |
| virtual void Internalize(Isolate* isolate) = 0; |
| |
| // This function can be called after internalizing. |
| V8_INLINE Handle<String> string() const { |
| DCHECK(!string_.is_null()); |
| return string_; |
| } |
| |
| protected: |
| // This is null until the string is internalized. |
| Handle<String> string_; |
| }; |
| |
| |
| class AstRawString : public AstString { |
| public: |
| int length() const OVERRIDE { |
| if (is_one_byte_) |
| return literal_bytes_.length(); |
| return literal_bytes_.length() / 2; |
| } |
| |
| void Internalize(Isolate* isolate) OVERRIDE; |
| |
| bool AsArrayIndex(uint32_t* index) const; |
| |
| // The string is not null-terminated, use length() to find out the length. |
| const unsigned char* raw_data() const { |
| return literal_bytes_.start(); |
| } |
| bool is_one_byte() const { return is_one_byte_; } |
| bool IsOneByteEqualTo(const char* data) const; |
| uint16_t FirstCharacter() const { |
| if (is_one_byte_) |
| return literal_bytes_[0]; |
| const uint16_t* c = |
| reinterpret_cast<const uint16_t*>(literal_bytes_.start()); |
| return *c; |
| } |
| |
| V8_INLINE bool IsArguments(AstValueFactory* ast_value_factory) const; |
| |
| // For storing AstRawStrings in a hash map. |
| uint32_t hash() const { |
| return hash_; |
| } |
| static bool Compare(void* a, void* b); |
| |
| bool operator==(const AstRawString& rhs) const; |
| |
| private: |
| friend class AstValueFactory; |
| friend class AstRawStringInternalizationKey; |
| |
| AstRawString(bool is_one_byte, const Vector<const byte>& literal_bytes, |
| uint32_t hash) |
| : is_one_byte_(is_one_byte), literal_bytes_(literal_bytes), hash_(hash) {} |
| |
| AstRawString() |
| : is_one_byte_(true), |
| hash_(0) {} |
| |
| bool is_one_byte_; |
| |
| // Points to memory owned by Zone. |
| Vector<const byte> literal_bytes_; |
| uint32_t hash_; |
| }; |
| |
| |
| class AstConsString : public AstString { |
| public: |
| AstConsString(const AstString* left, const AstString* right) |
| : left_(left), |
| right_(right) {} |
| |
| int length() const OVERRIDE { return left_->length() + right_->length(); } |
| |
| void Internalize(Isolate* isolate) OVERRIDE; |
| |
| private: |
| friend class AstValueFactory; |
| |
| const AstString* left_; |
| const AstString* right_; |
| }; |
| |
| |
| // AstValue is either a string, a number, a string array, a boolean, or a |
| // special value (null, undefined, the hole). |
| class AstValue : public ZoneObject { |
| public: |
| bool IsString() const { |
| return type_ == STRING; |
| } |
| |
| bool IsNumber() const { |
| return type_ == NUMBER || type_ == SMI; |
| } |
| |
| const AstRawString* AsString() const { |
| if (type_ == STRING) |
| return string_; |
| UNREACHABLE(); |
| return 0; |
| } |
| |
| double AsNumber() const { |
| if (type_ == NUMBER) |
| return number_; |
| if (type_ == SMI) |
| return smi_; |
| UNREACHABLE(); |
| return 0; |
| } |
| |
| bool EqualsString(const AstRawString* string) const { |
| return type_ == STRING && string_ == string; |
| } |
| |
| bool IsPropertyName() const; |
| |
| bool BooleanValue() const; |
| |
| void Internalize(Isolate* isolate); |
| |
| // Can be called after Internalize has been called. |
| V8_INLINE Handle<Object> value() const { |
| if (type_ == STRING) { |
| return string_->string(); |
| } |
| DCHECK(!value_.is_null()); |
| return value_; |
| } |
| |
| private: |
| friend class AstValueFactory; |
| |
| enum Type { |
| STRING, |
| SYMBOL, |
| NUMBER, |
| SMI, |
| BOOLEAN, |
| NULL_TYPE, |
| UNDEFINED, |
| THE_HOLE |
| }; |
| |
| explicit AstValue(const AstRawString* s) : type_(STRING) { string_ = s; } |
| |
| explicit AstValue(const char* name) : type_(SYMBOL) { symbol_name_ = name; } |
| |
| explicit AstValue(double n) : type_(NUMBER) { number_ = n; } |
| |
| AstValue(Type t, int i) : type_(t) { |
| DCHECK(type_ == SMI); |
| smi_ = i; |
| } |
| |
| explicit AstValue(bool b) : type_(BOOLEAN) { bool_ = b; } |
| |
| explicit AstValue(Type t) : type_(t) { |
| DCHECK(t == NULL_TYPE || t == UNDEFINED || t == THE_HOLE); |
| } |
| |
| Type type_; |
| |
| // Uninternalized value. |
| union { |
| const AstRawString* string_; |
| double number_; |
| int smi_; |
| bool bool_; |
| ZoneList<const AstRawString*>* strings_; |
| const char* symbol_name_; |
| }; |
| |
| // Internalized value (empty before internalized). |
| Handle<Object> value_; |
| }; |
| |
| |
| // For generating constants. |
| #define STRING_CONSTANTS(F) \ |
| F(anonymous_function, "(anonymous function)") \ |
| F(arguments, "arguments") \ |
| F(constructor, "constructor") \ |
| F(done, "done") \ |
| F(dot, ".") \ |
| F(dot_for, ".for") \ |
| F(dot_generator, ".generator") \ |
| F(dot_generator_object, ".generator_object") \ |
| F(dot_iterator, ".iterator") \ |
| F(dot_module, ".module") \ |
| F(dot_result, ".result") \ |
| F(empty, "") \ |
| F(eval, "eval") \ |
| F(get_template_callsite, "GetTemplateCallSite") \ |
| F(initialize_const_global, "initializeConstGlobal") \ |
| F(initialize_var_global, "initializeVarGlobal") \ |
| F(let, "let") \ |
| F(make_reference_error, "MakeReferenceErrorEmbedded") \ |
| F(make_syntax_error, "MakeSyntaxErrorEmbedded") \ |
| F(make_type_error, "MakeTypeErrorEmbedded") \ |
| F(module, "module") \ |
| F(native, "native") \ |
| F(next, "next") \ |
| F(proto, "__proto__") \ |
| F(prototype, "prototype") \ |
| F(this, "this") \ |
| F(use_asm, "use asm") \ |
| F(use_strict, "use strict") \ |
| F(value, "value") |
| |
| #define OTHER_CONSTANTS(F) \ |
| F(true_value) \ |
| F(false_value) \ |
| F(null_value) \ |
| F(undefined_value) \ |
| F(the_hole_value) |
| |
| class AstValueFactory { |
| public: |
| AstValueFactory(Zone* zone, uint32_t hash_seed) |
| : string_table_(AstRawString::Compare), |
| zone_(zone), |
| isolate_(NULL), |
| hash_seed_(hash_seed) { |
| #define F(name, str) name##_string_ = NULL; |
| STRING_CONSTANTS(F) |
| #undef F |
| #define F(name) name##_ = NULL; |
| OTHER_CONSTANTS(F) |
| #undef F |
| } |
| |
| Zone* zone() const { return zone_; } |
| |
| const AstRawString* GetOneByteString(Vector<const uint8_t> literal) { |
| return GetOneByteStringInternal(literal); |
| } |
| const AstRawString* GetOneByteString(const char* string) { |
| return GetOneByteString(Vector<const uint8_t>( |
| reinterpret_cast<const uint8_t*>(string), StrLength(string))); |
| } |
| const AstRawString* GetTwoByteString(Vector<const uint16_t> literal) { |
| return GetTwoByteStringInternal(literal); |
| } |
| const AstRawString* GetString(Handle<String> literal); |
| const AstConsString* NewConsString(const AstString* left, |
| const AstString* right); |
| |
| void Internalize(Isolate* isolate); |
| bool IsInternalized() { |
| return isolate_ != NULL; |
| } |
| |
| #define F(name, str) \ |
| const AstRawString* name##_string() { \ |
| if (name##_string_ == NULL) { \ |
| const char* data = str; \ |
| name##_string_ = GetOneByteString( \ |
| Vector<const uint8_t>(reinterpret_cast<const uint8_t*>(data), \ |
| static_cast<int>(strlen(data)))); \ |
| } \ |
| return name##_string_; \ |
| } |
| STRING_CONSTANTS(F) |
| #undef F |
| |
| const AstValue* NewString(const AstRawString* string); |
| // A JavaScript symbol (ECMA-262 edition 6). |
| const AstValue* NewSymbol(const char* name); |
| const AstValue* NewNumber(double number); |
| const AstValue* NewSmi(int number); |
| const AstValue* NewBoolean(bool b); |
| const AstValue* NewStringList(ZoneList<const AstRawString*>* strings); |
| const AstValue* NewNull(); |
| const AstValue* NewUndefined(); |
| const AstValue* NewTheHole(); |
| |
| private: |
| AstRawString* GetOneByteStringInternal(Vector<const uint8_t> literal); |
| AstRawString* GetTwoByteStringInternal(Vector<const uint16_t> literal); |
| AstRawString* GetString(uint32_t hash, bool is_one_byte, |
| Vector<const byte> literal_bytes); |
| |
| // All strings are copied here, one after another (no NULLs inbetween). |
| HashMap string_table_; |
| // For keeping track of all AstValues and AstRawStrings we've created (so that |
| // they can be internalized later). |
| List<AstValue*> values_; |
| List<AstString*> strings_; |
| Zone* zone_; |
| Isolate* isolate_; |
| |
| uint32_t hash_seed_; |
| |
| #define F(name, str) const AstRawString* name##_string_; |
| STRING_CONSTANTS(F) |
| #undef F |
| |
| #define F(name) AstValue* name##_; |
| OTHER_CONSTANTS(F) |
| #undef F |
| }; |
| |
| |
| bool AstRawString::IsArguments(AstValueFactory* ast_value_factory) const { |
| return ast_value_factory->arguments_string() == this; |
| } |
| } } // namespace v8::internal |
| |
| #undef STRING_CONSTANTS |
| #undef OTHER_CONSTANTS |
| |
| #endif // V8_AST_VALUE_FACTORY_H_ |