| // 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. |
| |
| #ifndef V8_OBJECTS_H_ |
| #define V8_OBJECTS_H_ |
| |
| #include "builtins.h" |
| #include "code-stubs.h" |
| #include "smart-pointer.h" |
| #include "unicode-inl.h" |
| |
| // |
| // All object types in the V8 JavaScript are described in this file. |
| // |
| // Inheritance hierarchy: |
| // - Object |
| // - Smi (immediate small integer) |
| // - Failure (immediate for marking failed operation) |
| // - HeapObject (superclass for everything allocated in the heap) |
| // - JSObject |
| // - JSArray |
| // - JSRegExp |
| // - JSFunction |
| // - GlobalObject |
| // - JSGlobalObject |
| // - JSBuiltinsObject |
| // - JSGlobalProxy |
| // - JSValue |
| // - Script |
| // - Array |
| // - ByteArray |
| // - FixedArray |
| // - DescriptorArray |
| // - HashTable |
| // - Dictionary |
| // - SymbolTable |
| // - CompilationCacheTable |
| // - MapCache |
| // - LookupCache |
| // - Context |
| // - GlobalContext |
| // - String |
| // - SeqString |
| // - SeqAsciiString |
| // - SeqTwoByteString |
| // - ConsString |
| // - SlicedString |
| // - ExternalString |
| // - ExternalAsciiString |
| // - ExternalTwoByteString |
| // - HeapNumber |
| // - Code |
| // - Map |
| // - Oddball |
| // - Proxy |
| // - SharedFunctionInfo |
| // - Struct |
| // - AccessorInfo |
| // - AccessCheckInfo |
| // - InterceptorInfo |
| // - CallHandlerInfo |
| // - FunctionTemplateInfo |
| // - ObjectTemplateInfo |
| // - SignatureInfo |
| // - TypeSwitchInfo |
| // - DebugInfo |
| // - BreakPointInfo |
| // |
| // Formats of Object*: |
| // Smi: [31 bit signed int] 0 |
| // HeapObject: [32 bit direct pointer] (4 byte aligned) | 01 |
| // Failure: [30 bit signed int] 11 |
| |
| |
| // Ecma-262 3rd 8.6.1 |
| enum PropertyAttributes { |
| NONE = v8::None, |
| READ_ONLY = v8::ReadOnly, |
| DONT_ENUM = v8::DontEnum, |
| DONT_DELETE = v8::DontDelete, |
| ABSENT = 16 // Used in runtime to indicate a property is absent. |
| // ABSENT can never be stored in or returned from a descriptor's attributes |
| // bitfield. It is only used as a return value meaning the attributes of |
| // a non-existent property. |
| }; |
| |
| namespace v8 { namespace internal { |
| |
| |
| // PropertyDetails captures type and attributes for a property. |
| // They are used both in property dictionaries and instance descriptors. |
| class PropertyDetails BASE_EMBEDDED { |
| public: |
| |
| PropertyDetails(PropertyAttributes attributes, |
| PropertyType type, |
| int index = 0) { |
| ASSERT(TypeField::is_valid(type)); |
| ASSERT(AttributesField::is_valid(attributes)); |
| ASSERT(IndexField::is_valid(index)); |
| |
| value_ = TypeField::encode(type) |
| | AttributesField::encode(attributes) |
| | IndexField::encode(index); |
| |
| ASSERT(type == this->type()); |
| ASSERT(attributes == this->attributes()); |
| ASSERT(index == this->index()); |
| } |
| |
| // Conversion for storing details as Object*. |
| inline PropertyDetails(Smi* smi); |
| inline Smi* AsSmi(); |
| |
| PropertyType type() { return TypeField::decode(value_); } |
| |
| bool IsTransition() { |
| PropertyType t = type(); |
| ASSERT(t != INTERCEPTOR); |
| return t == MAP_TRANSITION || t == CONSTANT_TRANSITION; |
| } |
| |
| bool IsProperty() { |
| return type() < FIRST_PHANTOM_PROPERTY_TYPE; |
| } |
| |
| PropertyAttributes attributes() { return AttributesField::decode(value_); } |
| |
| int index() { return IndexField::decode(value_); } |
| |
| static bool IsValidIndex(int index) { return IndexField::is_valid(index); } |
| |
| bool IsReadOnly() { return (attributes() & READ_ONLY) != 0; } |
| bool IsDontDelete() { return (attributes() & DONT_DELETE) != 0; } |
| bool IsDontEnum() { return (attributes() & DONT_ENUM) != 0; } |
| |
| // Bit fields in value_ (type, shift, size). Must be public so the |
| // constants can be embedded in generated code. |
| class TypeField: public BitField<PropertyType, 0, 3> {}; |
| class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; |
| class IndexField: public BitField<uint32_t, 6, 32-6> {}; |
| |
| static const int kInitialIndex = 1; |
| |
| private: |
| uint32_t value_; |
| }; |
| |
| |
| // Setter that skips the write barrier if mode is SKIP_WRITE_BARRIER. |
| enum WriteBarrierMode { SKIP_WRITE_BARRIER, UPDATE_WRITE_BARRIER }; |
| |
| |
| // PropertyNormalizationMode is used to specify whether to keep |
| // inobject properties when normalizing properties of a JSObject. |
| enum PropertyNormalizationMode { |
| CLEAR_INOBJECT_PROPERTIES, |
| KEEP_INOBJECT_PROPERTIES |
| }; |
| |
| |
| // All Maps have a field instance_type containing a InstanceType. |
| // It describes the type of the instances. |
| // |
| // As an example, a JavaScript object is a heap object and its map |
| // instance_type is JS_OBJECT_TYPE. |
| // |
| // The names of the string instance types are intended to systematically |
| // mirror their encoding in the instance_type field of the map. The length |
| // (SHORT, MEDIUM, or LONG) is always mentioned. The default encoding is |
| // considered TWO_BYTE. It is not mentioned in the name. ASCII encoding is |
| // mentioned explicitly in the name. Likewise, the default representation is |
| // considered sequential. It is not mentioned in the name. The other |
| // representations (eg, CONS, SLICED, EXTERNAL) are explicitly mentioned. |
| // Finally, the string is either a SYMBOL_TYPE (if it is a symbol) or a |
| // STRING_TYPE (if it is not a symbol). |
| // |
| // NOTE: The following things are some that depend on the string types having |
| // instance_types that are less than those of all other types: |
| // HeapObject::Size, HeapObject::IterateBody, the typeof operator, and |
| // Object::IsString. |
| // |
| // NOTE: Everything following JS_VALUE_TYPE is considered a |
| // JSObject for GC purposes. The first four entries here have typeof |
| // 'object', whereas JS_FUNCTION_TYPE has typeof 'function'. |
| #define INSTANCE_TYPE_LIST(V) \ |
| V(SHORT_SYMBOL_TYPE) \ |
| V(MEDIUM_SYMBOL_TYPE) \ |
| V(LONG_SYMBOL_TYPE) \ |
| V(SHORT_ASCII_SYMBOL_TYPE) \ |
| V(MEDIUM_ASCII_SYMBOL_TYPE) \ |
| V(LONG_ASCII_SYMBOL_TYPE) \ |
| V(SHORT_CONS_SYMBOL_TYPE) \ |
| V(MEDIUM_CONS_SYMBOL_TYPE) \ |
| V(LONG_CONS_SYMBOL_TYPE) \ |
| V(SHORT_CONS_ASCII_SYMBOL_TYPE) \ |
| V(MEDIUM_CONS_ASCII_SYMBOL_TYPE) \ |
| V(LONG_CONS_ASCII_SYMBOL_TYPE) \ |
| V(SHORT_SLICED_SYMBOL_TYPE) \ |
| V(MEDIUM_SLICED_SYMBOL_TYPE) \ |
| V(LONG_SLICED_SYMBOL_TYPE) \ |
| V(SHORT_SLICED_ASCII_SYMBOL_TYPE) \ |
| V(MEDIUM_SLICED_ASCII_SYMBOL_TYPE) \ |
| V(LONG_SLICED_ASCII_SYMBOL_TYPE) \ |
| V(SHORT_EXTERNAL_SYMBOL_TYPE) \ |
| V(MEDIUM_EXTERNAL_SYMBOL_TYPE) \ |
| V(LONG_EXTERNAL_SYMBOL_TYPE) \ |
| V(SHORT_EXTERNAL_ASCII_SYMBOL_TYPE) \ |
| V(MEDIUM_EXTERNAL_ASCII_SYMBOL_TYPE) \ |
| V(LONG_EXTERNAL_ASCII_SYMBOL_TYPE) \ |
| V(SHORT_STRING_TYPE) \ |
| V(MEDIUM_STRING_TYPE) \ |
| V(LONG_STRING_TYPE) \ |
| V(SHORT_ASCII_STRING_TYPE) \ |
| V(MEDIUM_ASCII_STRING_TYPE) \ |
| V(LONG_ASCII_STRING_TYPE) \ |
| V(SHORT_CONS_STRING_TYPE) \ |
| V(MEDIUM_CONS_STRING_TYPE) \ |
| V(LONG_CONS_STRING_TYPE) \ |
| V(SHORT_CONS_ASCII_STRING_TYPE) \ |
| V(MEDIUM_CONS_ASCII_STRING_TYPE) \ |
| V(LONG_CONS_ASCII_STRING_TYPE) \ |
| V(SHORT_SLICED_STRING_TYPE) \ |
| V(MEDIUM_SLICED_STRING_TYPE) \ |
| V(LONG_SLICED_STRING_TYPE) \ |
| V(SHORT_SLICED_ASCII_STRING_TYPE) \ |
| V(MEDIUM_SLICED_ASCII_STRING_TYPE) \ |
| V(LONG_SLICED_ASCII_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_STRING_TYPE) \ |
| V(MEDIUM_EXTERNAL_STRING_TYPE) \ |
| V(LONG_EXTERNAL_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_ASCII_STRING_TYPE) \ |
| V(MEDIUM_EXTERNAL_ASCII_STRING_TYPE) \ |
| V(LONG_EXTERNAL_ASCII_STRING_TYPE) \ |
| V(LONG_PRIVATE_EXTERNAL_ASCII_STRING_TYPE) \ |
| \ |
| V(MAP_TYPE) \ |
| V(HEAP_NUMBER_TYPE) \ |
| V(FIXED_ARRAY_TYPE) \ |
| V(CODE_TYPE) \ |
| V(ODDBALL_TYPE) \ |
| V(PROXY_TYPE) \ |
| V(BYTE_ARRAY_TYPE) \ |
| V(FILLER_TYPE) \ |
| \ |
| V(ACCESSOR_INFO_TYPE) \ |
| V(ACCESS_CHECK_INFO_TYPE) \ |
| V(INTERCEPTOR_INFO_TYPE) \ |
| V(SHARED_FUNCTION_INFO_TYPE) \ |
| V(CALL_HANDLER_INFO_TYPE) \ |
| V(FUNCTION_TEMPLATE_INFO_TYPE) \ |
| V(OBJECT_TEMPLATE_INFO_TYPE) \ |
| V(SIGNATURE_INFO_TYPE) \ |
| V(TYPE_SWITCH_INFO_TYPE) \ |
| V(DEBUG_INFO_TYPE) \ |
| V(BREAK_POINT_INFO_TYPE) \ |
| V(SCRIPT_TYPE) \ |
| \ |
| V(JS_VALUE_TYPE) \ |
| V(JS_OBJECT_TYPE) \ |
| V(JS_CONTEXT_EXTENSION_OBJECT_TYPE) \ |
| V(JS_GLOBAL_OBJECT_TYPE) \ |
| V(JS_BUILTINS_OBJECT_TYPE) \ |
| V(JS_GLOBAL_PROXY_TYPE) \ |
| V(JS_ARRAY_TYPE) \ |
| V(JS_REGEXP_TYPE) \ |
| \ |
| V(JS_FUNCTION_TYPE) \ |
| |
| |
| // Since string types are not consecutive, this macro is used to |
| // iterate over them. |
| #define STRING_TYPE_LIST(V) \ |
| V(SHORT_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, short_symbol) \ |
| V(MEDIUM_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, medium_symbol) \ |
| V(LONG_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, long_symbol) \ |
| V(SHORT_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, short_ascii_symbol) \ |
| V(MEDIUM_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, medium_ascii_symbol)\ |
| V(LONG_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, long_ascii_symbol) \ |
| V(SHORT_CONS_SYMBOL_TYPE, ConsString::kSize, short_cons_symbol) \ |
| V(MEDIUM_CONS_SYMBOL_TYPE, ConsString::kSize, medium_cons_symbol) \ |
| V(LONG_CONS_SYMBOL_TYPE, ConsString::kSize, long_cons_symbol) \ |
| V(SHORT_CONS_ASCII_SYMBOL_TYPE, ConsString::kSize, short_cons_ascii_symbol) \ |
| V(MEDIUM_CONS_ASCII_SYMBOL_TYPE, ConsString::kSize, medium_cons_ascii_symbol)\ |
| V(LONG_CONS_ASCII_SYMBOL_TYPE, ConsString::kSize, long_cons_ascii_symbol) \ |
| V(SHORT_SLICED_SYMBOL_TYPE, SlicedString::kSize, short_sliced_symbol) \ |
| V(MEDIUM_SLICED_SYMBOL_TYPE, SlicedString::kSize, medium_sliced_symbol) \ |
| V(LONG_SLICED_SYMBOL_TYPE, SlicedString::kSize, long_sliced_symbol) \ |
| V(SHORT_SLICED_ASCII_SYMBOL_TYPE, \ |
| SlicedString::kSize, \ |
| short_sliced_ascii_symbol) \ |
| V(MEDIUM_SLICED_ASCII_SYMBOL_TYPE, \ |
| SlicedString::kSize, \ |
| medium_sliced_ascii_symbol) \ |
| V(LONG_SLICED_ASCII_SYMBOL_TYPE, \ |
| SlicedString::kSize, \ |
| long_sliced_ascii_symbol) \ |
| V(SHORT_EXTERNAL_SYMBOL_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| short_external_symbol) \ |
| V(MEDIUM_EXTERNAL_SYMBOL_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| medium_external_symbol) \ |
| V(LONG_EXTERNAL_SYMBOL_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| long_external_symbol) \ |
| V(SHORT_EXTERNAL_ASCII_SYMBOL_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| short_external_ascii_symbol) \ |
| V(MEDIUM_EXTERNAL_ASCII_SYMBOL_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| medium_external_ascii_symbol) \ |
| V(LONG_EXTERNAL_ASCII_SYMBOL_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| long_external_ascii_symbol) \ |
| V(SHORT_STRING_TYPE, SeqTwoByteString::kHeaderSize, short_string) \ |
| V(MEDIUM_STRING_TYPE, SeqTwoByteString::kHeaderSize, medium_string) \ |
| V(LONG_STRING_TYPE, SeqTwoByteString::kHeaderSize, long_string) \ |
| V(SHORT_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, short_ascii_string) \ |
| V(MEDIUM_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, medium_ascii_string)\ |
| V(LONG_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, long_ascii_string) \ |
| V(SHORT_CONS_STRING_TYPE, ConsString::kSize, short_cons_string) \ |
| V(MEDIUM_CONS_STRING_TYPE, ConsString::kSize, medium_cons_string) \ |
| V(LONG_CONS_STRING_TYPE, ConsString::kSize, long_cons_string) \ |
| V(SHORT_CONS_ASCII_STRING_TYPE, ConsString::kSize, short_cons_ascii_string) \ |
| V(MEDIUM_CONS_ASCII_STRING_TYPE, ConsString::kSize, medium_cons_ascii_string)\ |
| V(LONG_CONS_ASCII_STRING_TYPE, ConsString::kSize, long_cons_ascii_string) \ |
| V(SHORT_SLICED_STRING_TYPE, SlicedString::kSize, short_sliced_string) \ |
| V(MEDIUM_SLICED_STRING_TYPE, SlicedString::kSize, medium_sliced_string) \ |
| V(LONG_SLICED_STRING_TYPE, SlicedString::kSize, long_sliced_string) \ |
| V(SHORT_SLICED_ASCII_STRING_TYPE, \ |
| SlicedString::kSize, \ |
| short_sliced_ascii_string) \ |
| V(MEDIUM_SLICED_ASCII_STRING_TYPE, \ |
| SlicedString::kSize, \ |
| medium_sliced_ascii_string) \ |
| V(LONG_SLICED_ASCII_STRING_TYPE, \ |
| SlicedString::kSize, \ |
| long_sliced_ascii_string) \ |
| V(SHORT_EXTERNAL_STRING_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| short_external_string) \ |
| V(MEDIUM_EXTERNAL_STRING_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| medium_external_string) \ |
| V(LONG_EXTERNAL_STRING_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| long_external_string) \ |
| V(SHORT_EXTERNAL_ASCII_STRING_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| short_external_ascii_string) \ |
| V(MEDIUM_EXTERNAL_ASCII_STRING_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| medium_external_ascii_string) \ |
| V(LONG_EXTERNAL_ASCII_STRING_TYPE, \ |
| ExternalAsciiString::kSize, \ |
| long_external_ascii_string) |
| |
| // A struct is a simple object a set of object-valued fields. Including an |
| // object type in this causes the compiler to generate most of the boilerplate |
| // code for the class including allocation and garbage collection routines, |
| // casts and predicates. All you need to define is the class, methods and |
| // object verification routines. Easy, no? |
| // |
| // Note that for subtle reasons related to the ordering or numerical values of |
| // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST |
| // manually. |
| #define STRUCT_LIST_ALL(V) \ |
| V(ACCESSOR_INFO, AccessorInfo, accessor_info) \ |
| V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info) \ |
| V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info) \ |
| V(CALL_HANDLER_INFO, CallHandlerInfo, call_handler_info) \ |
| V(FUNCTION_TEMPLATE_INFO, FunctionTemplateInfo, function_template_info) \ |
| V(OBJECT_TEMPLATE_INFO, ObjectTemplateInfo, object_template_info) \ |
| V(SIGNATURE_INFO, SignatureInfo, signature_info) \ |
| V(TYPE_SWITCH_INFO, TypeSwitchInfo, type_switch_info) \ |
| V(SCRIPT, Script, script) |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| #define STRUCT_LIST_DEBUGGER(V) \ |
| V(DEBUG_INFO, DebugInfo, debug_info) \ |
| V(BREAK_POINT_INFO, BreakPointInfo, break_point_info) |
| #else |
| #define STRUCT_LIST_DEBUGGER(V) |
| #endif |
| |
| #define STRUCT_LIST(V) \ |
| STRUCT_LIST_ALL(V) \ |
| STRUCT_LIST_DEBUGGER(V) |
| |
| // We use the full 8 bits of the instance_type field to encode heap object |
| // instance types. The high-order bit (bit 7) is set if the object is not a |
| // string, and cleared if it is a string. |
| const uint32_t kIsNotStringMask = 0x80; |
| const uint32_t kStringTag = 0x0; |
| const uint32_t kNotStringTag = 0x80; |
| |
| // If bit 7 is clear, bit 5 indicates that the string is a symbol (if set) or |
| // not (if cleared). |
| const uint32_t kIsSymbolMask = 0x20; |
| const uint32_t kNotSymbolTag = 0x0; |
| const uint32_t kSymbolTag = 0x20; |
| |
| // If bit 7 is clear, bits 3 and 4 are the string's size (short, medium or |
| // long). These values are very special in that they are also used to shift |
| // the length field to get the length, removing the hash value. This avoids |
| // using if or switch when getting the length of a string. |
| const uint32_t kStringSizeMask = 0x18; |
| const uint32_t kShortStringTag = 0x18; |
| const uint32_t kMediumStringTag = 0x10; |
| const uint32_t kLongStringTag = 0x00; |
| |
| // If bit 7 is clear then bit 2 indicates whether the string consists of |
| // two-byte characters or one-byte characters. |
| const uint32_t kStringEncodingMask = 0x4; |
| const uint32_t kTwoByteStringTag = 0x0; |
| const uint32_t kAsciiStringTag = 0x4; |
| |
| // If bit 7 is clear, the low-order 2 bits indicate the representation |
| // of the string. |
| const uint32_t kStringRepresentationMask = 0x03; |
| enum StringRepresentationTag { |
| kSeqStringTag = 0x0, |
| kConsStringTag = 0x1, |
| kSlicedStringTag = 0x2, |
| kExternalStringTag = 0x3 |
| }; |
| |
| |
| // A ConsString with an empty string as the right side is a candidate |
| // for being shortcut by the garbage collector unless it is a |
| // symbol. It's not common to have non-flat symbols, so we do not |
| // shortcut them thereby avoiding turning symbols into strings. See |
| // heap.cc and mark-compact.cc. |
| const uint32_t kShortcutTypeMask = |
| kIsNotStringMask | |
| kIsSymbolMask | |
| kStringRepresentationMask; |
| const uint32_t kShortcutTypeTag = kConsStringTag; |
| |
| |
| enum InstanceType { |
| SHORT_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSeqStringTag, |
| MEDIUM_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSeqStringTag, |
| LONG_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kSeqStringTag, |
| SHORT_ASCII_SYMBOL_TYPE = |
| kShortStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag, |
| MEDIUM_ASCII_SYMBOL_TYPE = |
| kMediumStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag, |
| LONG_ASCII_SYMBOL_TYPE = |
| kLongStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag, |
| SHORT_CONS_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kConsStringTag, |
| MEDIUM_CONS_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kConsStringTag, |
| LONG_CONS_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kConsStringTag, |
| SHORT_CONS_ASCII_SYMBOL_TYPE = |
| kShortStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag, |
| MEDIUM_CONS_ASCII_SYMBOL_TYPE = |
| kMediumStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag, |
| LONG_CONS_ASCII_SYMBOL_TYPE = |
| kLongStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag, |
| SHORT_SLICED_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSlicedStringTag, |
| MEDIUM_SLICED_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSlicedStringTag, |
| LONG_SLICED_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kSlicedStringTag, |
| SHORT_SLICED_ASCII_SYMBOL_TYPE = |
| kShortStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag, |
| MEDIUM_SLICED_ASCII_SYMBOL_TYPE = |
| kMediumStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag, |
| LONG_SLICED_ASCII_SYMBOL_TYPE = |
| kLongStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag, |
| SHORT_EXTERNAL_SYMBOL_TYPE = |
| kShortStringTag | kSymbolTag | kExternalStringTag, |
| MEDIUM_EXTERNAL_SYMBOL_TYPE = |
| kMediumStringTag | kSymbolTag | kExternalStringTag, |
| LONG_EXTERNAL_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kExternalStringTag, |
| SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = |
| kShortStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag, |
| MEDIUM_EXTERNAL_ASCII_SYMBOL_TYPE = |
| kMediumStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag, |
| LONG_EXTERNAL_ASCII_SYMBOL_TYPE = |
| kLongStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag, |
| SHORT_STRING_TYPE = kShortStringTag | kSeqStringTag, |
| MEDIUM_STRING_TYPE = kMediumStringTag | kSeqStringTag, |
| LONG_STRING_TYPE = kLongStringTag | kSeqStringTag, |
| SHORT_ASCII_STRING_TYPE = kShortStringTag | kAsciiStringTag | kSeqStringTag, |
| MEDIUM_ASCII_STRING_TYPE = kMediumStringTag | kAsciiStringTag | kSeqStringTag, |
| LONG_ASCII_STRING_TYPE = kLongStringTag | kAsciiStringTag | kSeqStringTag, |
| SHORT_CONS_STRING_TYPE = kShortStringTag | kConsStringTag, |
| MEDIUM_CONS_STRING_TYPE = kMediumStringTag | kConsStringTag, |
| LONG_CONS_STRING_TYPE = kLongStringTag | kConsStringTag, |
| SHORT_CONS_ASCII_STRING_TYPE = |
| kShortStringTag | kAsciiStringTag | kConsStringTag, |
| MEDIUM_CONS_ASCII_STRING_TYPE = |
| kMediumStringTag | kAsciiStringTag | kConsStringTag, |
| LONG_CONS_ASCII_STRING_TYPE = |
| kLongStringTag | kAsciiStringTag | kConsStringTag, |
| SHORT_SLICED_STRING_TYPE = kShortStringTag | kSlicedStringTag, |
| MEDIUM_SLICED_STRING_TYPE = kMediumStringTag | kSlicedStringTag, |
| LONG_SLICED_STRING_TYPE = kLongStringTag | kSlicedStringTag, |
| SHORT_SLICED_ASCII_STRING_TYPE = |
| kShortStringTag | kAsciiStringTag | kSlicedStringTag, |
| MEDIUM_SLICED_ASCII_STRING_TYPE = |
| kMediumStringTag | kAsciiStringTag | kSlicedStringTag, |
| LONG_SLICED_ASCII_STRING_TYPE = |
| kLongStringTag | kAsciiStringTag | kSlicedStringTag, |
| SHORT_EXTERNAL_STRING_TYPE = kShortStringTag | kExternalStringTag, |
| MEDIUM_EXTERNAL_STRING_TYPE = kMediumStringTag | kExternalStringTag, |
| LONG_EXTERNAL_STRING_TYPE = kLongStringTag | kExternalStringTag, |
| SHORT_EXTERNAL_ASCII_STRING_TYPE = |
| kShortStringTag | kAsciiStringTag | kExternalStringTag, |
| MEDIUM_EXTERNAL_ASCII_STRING_TYPE = |
| kMediumStringTag | kAsciiStringTag | kExternalStringTag, |
| LONG_EXTERNAL_ASCII_STRING_TYPE = |
| kLongStringTag | kAsciiStringTag | kExternalStringTag, |
| LONG_PRIVATE_EXTERNAL_ASCII_STRING_TYPE = LONG_EXTERNAL_ASCII_STRING_TYPE, |
| |
| MAP_TYPE = kNotStringTag, |
| HEAP_NUMBER_TYPE, |
| FIXED_ARRAY_TYPE, |
| CODE_TYPE, |
| ODDBALL_TYPE, |
| PROXY_TYPE, |
| BYTE_ARRAY_TYPE, |
| FILLER_TYPE, |
| SMI_TYPE, |
| |
| ACCESSOR_INFO_TYPE, |
| ACCESS_CHECK_INFO_TYPE, |
| INTERCEPTOR_INFO_TYPE, |
| SHARED_FUNCTION_INFO_TYPE, |
| CALL_HANDLER_INFO_TYPE, |
| FUNCTION_TEMPLATE_INFO_TYPE, |
| OBJECT_TEMPLATE_INFO_TYPE, |
| SIGNATURE_INFO_TYPE, |
| TYPE_SWITCH_INFO_TYPE, |
| DEBUG_INFO_TYPE, |
| BREAK_POINT_INFO_TYPE, |
| SCRIPT_TYPE, |
| |
| JS_VALUE_TYPE, |
| JS_OBJECT_TYPE, |
| JS_CONTEXT_EXTENSION_OBJECT_TYPE, |
| JS_GLOBAL_OBJECT_TYPE, |
| JS_BUILTINS_OBJECT_TYPE, |
| JS_GLOBAL_PROXY_TYPE, |
| JS_ARRAY_TYPE, |
| JS_REGEXP_TYPE, |
| |
| JS_FUNCTION_TYPE, |
| |
| // Pseudo-types |
| FIRST_NONSTRING_TYPE = MAP_TYPE, |
| FIRST_TYPE = 0x0, |
| INVALID_TYPE = FIRST_TYPE - 1, |
| LAST_TYPE = JS_FUNCTION_TYPE, |
| // Boundaries for testing the type is a JavaScript "object". Note that |
| // function objects are not counted as objects, even though they are |
| // implemented as such; only values whose typeof is "object" are included. |
| FIRST_JS_OBJECT_TYPE = JS_VALUE_TYPE, |
| LAST_JS_OBJECT_TYPE = JS_REGEXP_TYPE |
| }; |
| |
| |
| enum CompareResult { |
| LESS = -1, |
| EQUAL = 0, |
| GREATER = 1, |
| |
| NOT_EQUAL = GREATER |
| }; |
| |
| |
| #define DECL_BOOLEAN_ACCESSORS(name) \ |
| inline bool name(); \ |
| inline void set_##name(bool value); \ |
| |
| |
| #define DECL_ACCESSORS(name, type) \ |
| inline type* name(); \ |
| inline void set_##name(type* value, \ |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); \ |
| |
| |
| class StringStream; |
| class ObjectVisitor; |
| |
| struct ValueInfo : public Malloced { |
| ValueInfo() : type(FIRST_TYPE), ptr(NULL), str(NULL), number(0) { } |
| InstanceType type; |
| Object* ptr; |
| const char* str; |
| double number; |
| }; |
| |
| |
| // A template-ized version of the IsXXX functions. |
| template <class C> static inline bool Is(Object* obj); |
| |
| |
| // Object is the abstract superclass for all classes in the |
| // object hierarchy. |
| // Object does not use any virtual functions to avoid the |
| // allocation of the C++ vtable. |
| // Since Smi and Failure are subclasses of Object no |
| // data members can be present in Object. |
| class Object BASE_EMBEDDED { |
| public: |
| // Type testing. |
| inline bool IsSmi(); |
| inline bool IsHeapObject(); |
| inline bool IsHeapNumber(); |
| inline bool IsString(); |
| inline bool IsSymbol(); |
| inline bool IsSeqString(); |
| inline bool IsSlicedString(); |
| inline bool IsExternalString(); |
| inline bool IsConsString(); |
| inline bool IsExternalTwoByteString(); |
| inline bool IsExternalAsciiString(); |
| inline bool IsSeqTwoByteString(); |
| inline bool IsSeqAsciiString(); |
| |
| inline bool IsNumber(); |
| inline bool IsByteArray(); |
| inline bool IsFailure(); |
| inline bool IsRetryAfterGC(); |
| inline bool IsOutOfMemoryFailure(); |
| inline bool IsException(); |
| inline bool IsJSObject(); |
| inline bool IsJSContextExtensionObject(); |
| inline bool IsMap(); |
| inline bool IsFixedArray(); |
| inline bool IsDescriptorArray(); |
| inline bool IsContext(); |
| inline bool IsCatchContext(); |
| inline bool IsGlobalContext(); |
| inline bool IsJSFunction(); |
| inline bool IsCode(); |
| inline bool IsOddball(); |
| inline bool IsSharedFunctionInfo(); |
| inline bool IsJSValue(); |
| inline bool IsStringWrapper(); |
| inline bool IsProxy(); |
| inline bool IsBoolean(); |
| inline bool IsJSArray(); |
| inline bool IsJSRegExp(); |
| inline bool IsHashTable(); |
| inline bool IsDictionary(); |
| inline bool IsSymbolTable(); |
| inline bool IsCompilationCacheTable(); |
| inline bool IsMapCache(); |
| inline bool IsLookupCache(); |
| inline bool IsPrimitive(); |
| inline bool IsGlobalObject(); |
| inline bool IsJSGlobalObject(); |
| inline bool IsJSBuiltinsObject(); |
| inline bool IsJSGlobalProxy(); |
| inline bool IsUndetectableObject(); |
| inline bool IsAccessCheckNeeded(); |
| |
| // Returns true if this object is an instance of the specified |
| // function template. |
| bool IsInstanceOf(FunctionTemplateInfo* type); |
| |
| inline bool IsStruct(); |
| #define DECLARE_STRUCT_PREDICATE(NAME, Name, name) inline bool Is##Name(); |
| STRUCT_LIST(DECLARE_STRUCT_PREDICATE) |
| #undef DECLARE_STRUCT_PREDICATE |
| |
| // Oddball testing. |
| INLINE(bool IsUndefined()); |
| INLINE(bool IsTheHole()); |
| INLINE(bool IsNull()); |
| INLINE(bool IsTrue()); |
| INLINE(bool IsFalse()); |
| |
| // Extract the number. |
| inline double Number(); |
| |
| inline bool HasSpecificClassOf(String* name); |
| |
| Object* ToObject(); // ECMA-262 9.9. |
| Object* ToBoolean(); // ECMA-262 9.2. |
| |
| // Convert to a JSObject if needed. |
| // global_context is used when creating wrapper object. |
| Object* ToObject(Context* global_context); |
| |
| // Converts this to a Smi if possible. |
| // Failure is returned otherwise. |
| inline Object* ToSmi(); |
| |
| void Lookup(String* name, LookupResult* result); |
| |
| // Property access. |
| inline Object* GetProperty(String* key); |
| inline Object* GetProperty(String* key, PropertyAttributes* attributes); |
| Object* GetPropertyWithReceiver(Object* receiver, |
| String* key, |
| PropertyAttributes* attributes); |
| Object* GetProperty(Object* receiver, |
| LookupResult* result, |
| String* key, |
| PropertyAttributes* attributes); |
| Object* GetPropertyWithCallback(Object* receiver, |
| Object* structure, |
| String* name, |
| Object* holder); |
| Object* GetPropertyWithDefinedGetter(Object* receiver, |
| JSFunction* getter); |
| |
| inline Object* GetElement(uint32_t index); |
| Object* GetElementWithReceiver(Object* receiver, uint32_t index); |
| |
| // Return the object's prototype (might be Heap::null_value()). |
| Object* GetPrototype(); |
| |
| // Returns true if this is a JSValue containing a string and the index is |
| // < the length of the string. Used to implement [] on strings. |
| inline bool IsStringObjectWithCharacterAt(uint32_t index); |
| |
| #ifdef DEBUG |
| // Prints this object with details. |
| void Print(); |
| void PrintLn(); |
| // Verifies the object. |
| void Verify(); |
| |
| // Verify a pointer is a valid object pointer. |
| static void VerifyPointer(Object* p); |
| #endif |
| |
| // Prints this object without details. |
| void ShortPrint(); |
| |
| // Prints this object without details to a message accumulator. |
| void ShortPrint(StringStream* accumulator); |
| |
| // Casting: This cast is only needed to satisfy macros in objects-inl.h. |
| static Object* cast(Object* value) { return value; } |
| |
| // Layout description. |
| static const int kHeaderSize = 0; // Object does not take up any space. |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Object); |
| }; |
| |
| |
| // Smi represents integer Numbers that can be stored in 31 bits. |
| // Smis are immediate which means they are NOT allocated in the heap. |
| // The this pointer has the following format: [31 bit signed int] 0 |
| // Smi stands for small integer. |
| class Smi: public Object { |
| public: |
| // Returns the integer value. |
| inline int value(); |
| |
| // Convert a value to a Smi object. |
| static inline Smi* FromInt(int value); |
| |
| static inline Smi* FromIntptr(intptr_t value); |
| |
| // Returns whether value can be represented in a Smi. |
| static inline bool IsValid(int value); |
| |
| static inline bool IsIntptrValid(intptr_t); |
| |
| // Casting. |
| static inline Smi* cast(Object* object); |
| |
| // Dispatched behavior. |
| void SmiPrint(); |
| void SmiPrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void SmiVerify(); |
| #endif |
| |
| static const int kSmiNumBits = 31; |
| // Min and max limits for Smi values. |
| static const int kMinValue = -(1 << (kSmiNumBits - 1)); |
| static const int kMaxValue = (1 << (kSmiNumBits - 1)) - 1; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Smi); |
| }; |
| |
| |
| // Failure is used for reporting out of memory situations and |
| // propagating exceptions through the runtime system. Failure objects |
| // are transient and cannot occur as part of the objects graph. |
| // |
| // Failures are a single word, encoded as follows: |
| // +-------------------------+---+--+--+ |
| // |rrrrrrrrrrrrrrrrrrrrrrrrr|sss|tt|11| |
| // +-------------------------+---+--+--+ |
| // |
| // The low two bits, 0-1, are the failure tag, 11. The next two bits, |
| // 2-3, are a failure type tag 'tt' with possible values: |
| // 00 RETRY_AFTER_GC |
| // 01 EXCEPTION |
| // 10 INTERNAL_ERROR |
| // 11 OUT_OF_MEMORY_EXCEPTION |
| // |
| // The next three bits, 4-6, are an allocation space tag 'sss'. The |
| // allocation space tag is 000 for all failure types except |
| // RETRY_AFTER_GC. For RETRY_AFTER_GC, the possible values are |
| // (the encoding is found in globals.h): |
| // 000 NEW_SPACE |
| // 001 OLD_SPACE |
| // 010 CODE_SPACE |
| // 011 MAP_SPACE |
| // 100 LO_SPACE |
| // |
| // The remaining bits is the number of words requested by the |
| // allocation request that failed, and is zeroed except for |
| // RETRY_AFTER_GC failures. The 25 bits (on a 32 bit platform) gives |
| // a representable range of 2^27 bytes (128MB). |
| |
| // Failure type tag info. |
| const int kFailureTypeTagSize = 2; |
| const int kFailureTypeTagMask = (1 << kFailureTypeTagSize) - 1; |
| |
| class Failure: public Object { |
| public: |
| // RuntimeStubs assumes EXCEPTION = 1 in the compiler-generated code. |
| enum Type { |
| RETRY_AFTER_GC = 0, |
| EXCEPTION = 1, // Returning this marker tells the real exception |
| // is in Top::pending_exception. |
| INTERNAL_ERROR = 2, |
| OUT_OF_MEMORY_EXCEPTION = 3 |
| }; |
| |
| inline Type type() const; |
| |
| // Returns the space that needs to be collected for RetryAfterGC failures. |
| inline AllocationSpace allocation_space() const; |
| |
| // Returns the number of bytes requested (up to the representable maximum) |
| // for RetryAfterGC failures. |
| inline int requested() const; |
| |
| inline bool IsInternalError() const; |
| inline bool IsOutOfMemoryException() const; |
| |
| static Failure* RetryAfterGC(int requested_bytes, AllocationSpace space); |
| static inline Failure* RetryAfterGC(int requested_bytes); // NEW_SPACE |
| static inline Failure* Exception(); |
| static inline Failure* InternalError(); |
| static inline Failure* OutOfMemoryException(); |
| // Casting. |
| static inline Failure* cast(Object* object); |
| |
| // Dispatched behavior. |
| void FailurePrint(); |
| void FailurePrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void FailureVerify(); |
| #endif |
| |
| private: |
| inline int value() const; |
| static inline Failure* Construct(Type type, int value = 0); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Failure); |
| }; |
| |
| |
| // Heap objects typically have a map pointer in their first word. However, |
| // during GC other data (eg, mark bits, forwarding addresses) is sometimes |
| // encoded in the first word. The class MapWord is an abstraction of the |
| // value in a heap object's first word. |
| class MapWord BASE_EMBEDDED { |
| public: |
| // Normal state: the map word contains a map pointer. |
| |
| // Create a map word from a map pointer. |
| static inline MapWord FromMap(Map* map); |
| |
| // View this map word as a map pointer. |
| inline Map* ToMap(); |
| |
| |
| // Scavenge collection: the map word of live objects in the from space |
| // contains a forwarding address (a heap object pointer in the to space). |
| |
| // True if this map word is a forwarding address for a scavenge |
| // collection. Only valid during a scavenge collection (specifically, |
| // when all map words are heap object pointers, ie. not during a full GC). |
| inline bool IsForwardingAddress(); |
| |
| // Create a map word from a forwarding address. |
| static inline MapWord FromForwardingAddress(HeapObject* object); |
| |
| // View this map word as a forwarding address. |
| inline HeapObject* ToForwardingAddress(); |
| |
| |
| // Marking phase of full collection: the map word of live objects is |
| // marked, and may be marked as overflowed (eg, the object is live, its |
| // children have not been visited, and it does not fit in the marking |
| // stack). |
| |
| // True if this map word's mark bit is set. |
| inline bool IsMarked(); |
| |
| // Return this map word but with its mark bit set. |
| inline void SetMark(); |
| |
| // Return this map word but with its mark bit cleared. |
| inline void ClearMark(); |
| |
| // True if this map word's overflow bit is set. |
| inline bool IsOverflowed(); |
| |
| // Return this map word but with its overflow bit set. |
| inline void SetOverflow(); |
| |
| // Return this map word but with its overflow bit cleared. |
| inline void ClearOverflow(); |
| |
| |
| // Compacting phase of a full compacting collection: the map word of live |
| // objects contains an encoding of the original map address along with the |
| // forwarding address (represented as an offset from the first live object |
| // in the same page as the (old) object address). |
| |
| // Create a map word from a map address and a forwarding address offset. |
| static inline MapWord EncodeAddress(Address map_address, int offset); |
| |
| // Return the map address encoded in this map word. |
| inline Address DecodeMapAddress(MapSpace* map_space); |
| |
| // Return the forwarding offset encoded in this map word. |
| inline int DecodeOffset(); |
| |
| |
| // During serialization: the map word is used to hold an encoded |
| // address, and possibly a mark bit (set and cleared with SetMark |
| // and ClearMark). |
| |
| // Create a map word from an encoded address. |
| static inline MapWord FromEncodedAddress(Address address); |
| |
| inline Address ToEncodedAddress(); |
| |
| private: |
| // HeapObject calls the private constructor and directly reads the value. |
| friend class HeapObject; |
| |
| explicit MapWord(uintptr_t value) : value_(value) {} |
| |
| uintptr_t value_; |
| |
| // Bits used by the marking phase of the garbage collector. |
| // |
| // The first word of a heap object is normally a map pointer. The last two |
| // bits are tagged as '01' (kHeapObjectTag). We reuse the last two bits to |
| // mark an object as live and/or overflowed: |
| // last bit = 0, marked as alive |
| // second bit = 1, overflowed |
| // An object is only marked as overflowed when it is marked as live while |
| // the marking stack is overflowed. |
| static const int kMarkingBit = 0; // marking bit |
| static const int kMarkingMask = (1 << kMarkingBit); // marking mask |
| static const int kOverflowBit = 1; // overflow bit |
| static const int kOverflowMask = (1 << kOverflowBit); // overflow mask |
| |
| // Forwarding pointers and map pointer encoding |
| // 31 21 20 10 9 0 |
| // +-----------------+------------------+-----------------+ |
| // |forwarding offset|page offset of map|page index of map| |
| // +-----------------+------------------+-----------------+ |
| // 11 bits 11 bits 10 bits |
| static const int kMapPageIndexBits = 10; |
| static const int kMapPageOffsetBits = 11; |
| static const int kForwardingOffsetBits = 11; |
| |
| static const int kMapPageIndexShift = 0; |
| static const int kMapPageOffsetShift = |
| kMapPageIndexShift + kMapPageIndexBits; |
| static const int kForwardingOffsetShift = |
| kMapPageOffsetShift + kMapPageOffsetBits; |
| |
| // 0x000003FF |
| static const uint32_t kMapPageIndexMask = |
| (1 << kMapPageOffsetShift) - 1; |
| |
| // 0x001FFC00 |
| static const uint32_t kMapPageOffsetMask = |
| ((1 << kForwardingOffsetShift) - 1) & ~kMapPageIndexMask; |
| |
| // 0xFFE00000 |
| static const uint32_t kForwardingOffsetMask = |
| ~(kMapPageIndexMask | kMapPageOffsetMask); |
| }; |
| |
| |
| // HeapObject is the superclass for all classes describing heap allocated |
| // objects. |
| class HeapObject: public Object { |
| public: |
| // [map]: Contains a map which contains the object's reflective |
| // information. |
| inline Map* map(); |
| inline void set_map(Map* value); |
| |
| // During garbage collection, the map word of a heap object does not |
| // necessarily contain a map pointer. |
| inline MapWord map_word(); |
| inline void set_map_word(MapWord map_word); |
| |
| // Converts an address to a HeapObject pointer. |
| static inline HeapObject* FromAddress(Address address); |
| |
| // Returns the address of this HeapObject. |
| inline Address address(); |
| |
| // Iterates over pointers contained in the object (including the Map) |
| void Iterate(ObjectVisitor* v); |
| |
| // Iterates over all pointers contained in the object except the |
| // first map pointer. The object type is given in the first |
| // parameter. This function does not access the map pointer in the |
| // object, and so is safe to call while the map pointer is modified. |
| void IterateBody(InstanceType type, int object_size, ObjectVisitor* v); |
| |
| // This method only applies to struct objects. Iterates over all the fields |
| // of this struct. |
| void IterateStructBody(int object_size, ObjectVisitor* v); |
| |
| // Returns the heap object's size in bytes |
| inline int Size(); |
| |
| // Given a heap object's map pointer, returns the heap size in bytes |
| // Useful when the map pointer field is used for other purposes. |
| // GC internal. |
| inline int SizeFromMap(Map* map); |
| |
| // Support for the marking heap objects during the marking phase of GC. |
| // True if the object is marked live. |
| inline bool IsMarked(); |
| |
| // Mutate this object's map pointer to indicate that the object is live. |
| inline void SetMark(); |
| |
| // Mutate this object's map pointer to remove the indication that the |
| // object is live (ie, partially restore the map pointer). |
| inline void ClearMark(); |
| |
| // True if this object is marked as overflowed. Overflowed objects have |
| // been reached and marked during marking of the heap, but their children |
| // have not necessarily been marked and they have not been pushed on the |
| // marking stack. |
| inline bool IsOverflowed(); |
| |
| // Mutate this object's map pointer to indicate that the object is |
| // overflowed. |
| inline void SetOverflow(); |
| |
| // Mutate this object's map pointer to remove the indication that the |
| // object is overflowed (ie, partially restore the map pointer). |
| inline void ClearOverflow(); |
| |
| // Returns the field at offset in obj, as a read/write Object* reference. |
| // Does no checking, and is safe to use during GC, while maps are invalid. |
| // Does not update remembered sets, so should only be assigned to |
| // during marking GC. |
| static inline Object** RawField(HeapObject* obj, int offset); |
| |
| // Casting. |
| static inline HeapObject* cast(Object* obj); |
| |
| // Return the write barrier mode for this. |
| inline WriteBarrierMode GetWriteBarrierMode(); |
| |
| // Dispatched behavior. |
| void HeapObjectShortPrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void HeapObjectPrint(); |
| void HeapObjectVerify(); |
| inline void VerifyObjectField(int offset); |
| |
| void PrintHeader(const char* id); |
| |
| // Verify a pointer is a valid HeapObject pointer that points to object |
| // areas in the heap. |
| static void VerifyHeapPointer(Object* p); |
| #endif |
| |
| // Layout description. |
| // First field in a heap object is map. |
| static const int kMapOffset = Object::kHeaderSize; |
| static const int kHeaderSize = kMapOffset + kPointerSize; |
| |
| protected: |
| // helpers for calling an ObjectVisitor to iterate over pointers in the |
| // half-open range [start, end) specified as integer offsets |
| inline void IteratePointers(ObjectVisitor* v, int start, int end); |
| // as above, for the single element at "offset" |
| inline void IteratePointer(ObjectVisitor* v, int offset); |
| |
| // Computes the object size from the map. |
| // Should only be used from SizeFromMap. |
| int SlowSizeFromMap(Map* map); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapObject); |
| }; |
| |
| |
| // The HeapNumber class describes heap allocated numbers that cannot be |
| // represented in a Smi (small integer) |
| class HeapNumber: public HeapObject { |
| public: |
| // [value]: number value. |
| inline double value(); |
| inline void set_value(double value); |
| |
| // Casting. |
| static inline HeapNumber* cast(Object* obj); |
| |
| // Dispatched behavior. |
| Object* HeapNumberToBoolean(); |
| void HeapNumberPrint(); |
| void HeapNumberPrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void HeapNumberVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kDoubleSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapNumber); |
| }; |
| |
| |
| // The JSObject describes real heap allocated JavaScript objects with |
| // properties. |
| // Note that the map of JSObject changes during execution to enable inline |
| // caching. |
| class JSObject: public HeapObject { |
| public: |
| // [properties]: Backing storage for properties. |
| // properties is a FixedArray in the fast case, and a Dictionary in the |
| // slow case. |
| DECL_ACCESSORS(properties, FixedArray) // Get and set fast properties. |
| inline void initialize_properties(); |
| inline bool HasFastProperties(); |
| inline Dictionary* property_dictionary(); // Gets slow properties. |
| |
| // [elements]: The elements (properties with names that are integers). |
| // elements is a FixedArray in the fast case, and a Dictionary in the slow |
| // case. |
| DECL_ACCESSORS(elements, FixedArray) // Get and set fast elements. |
| inline void initialize_elements(); |
| inline bool HasFastElements(); |
| inline Dictionary* element_dictionary(); // Gets slow elements. |
| |
| // Collects elements starting at index 0. |
| // Undefined values are placed after non-undefined values. |
| // Returns the number of non-undefined values. |
| Object* PrepareElementsForSort(uint32_t limit); |
| // As PrepareElementsForSort, but only on objects where elements is |
| // a dictionary, and it will stay a dictionary. |
| Object* PrepareSlowElementsForSort(uint32_t limit); |
| |
| Object* SetProperty(String* key, |
| Object* value, |
| PropertyAttributes attributes); |
| Object* SetProperty(LookupResult* result, |
| String* key, |
| Object* value, |
| PropertyAttributes attributes); |
| Object* SetPropertyWithFailedAccessCheck(LookupResult* result, |
| String* name, |
| Object* value); |
| Object* SetPropertyWithCallback(Object* structure, |
| String* name, |
| Object* value, |
| JSObject* holder); |
| Object* SetPropertyWithDefinedSetter(JSFunction* setter, |
| Object* value); |
| Object* SetPropertyWithInterceptor(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| Object* SetPropertyPostInterceptor(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| Object* IgnoreAttributesAndSetLocalProperty(String* key, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Sets a property that currently has lazy loading. |
| Object* SetLazyProperty(LookupResult* result, |
| String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Returns the class name ([[Class]] property in the specification). |
| String* class_name(); |
| |
| // Retrieve interceptors. |
| InterceptorInfo* GetNamedInterceptor(); |
| InterceptorInfo* GetIndexedInterceptor(); |
| |
| inline PropertyAttributes GetPropertyAttribute(String* name); |
| PropertyAttributes GetPropertyAttributeWithReceiver(JSObject* receiver, |
| String* name); |
| PropertyAttributes GetLocalPropertyAttribute(String* name); |
| |
| Object* DefineAccessor(String* name, bool is_getter, JSFunction* fun, |
| PropertyAttributes attributes); |
| Object* LookupAccessor(String* name, bool is_getter); |
| |
| // Used from Object::GetProperty(). |
| Object* GetPropertyWithFailedAccessCheck(Object* receiver, |
| LookupResult* result, |
| String* name, |
| PropertyAttributes* attributes); |
| Object* GetPropertyWithInterceptor(JSObject* receiver, |
| String* name, |
| PropertyAttributes* attributes); |
| Object* GetPropertyPostInterceptor(JSObject* receiver, |
| String* name, |
| PropertyAttributes* attributes); |
| Object* GetLazyProperty(Object* receiver, |
| LookupResult* result, |
| String* name, |
| PropertyAttributes* attributes); |
| |
| // Tells whether this object needs to be loaded. |
| inline bool IsLoaded(); |
| |
| bool HasProperty(String* name) { |
| return GetPropertyAttribute(name) != ABSENT; |
| } |
| |
| // Can cause a GC if it hits an interceptor. |
| bool HasLocalProperty(String* name) { |
| return GetLocalPropertyAttribute(name) != ABSENT; |
| } |
| |
| Object* DeleteProperty(String* name); |
| Object* DeleteElement(uint32_t index); |
| Object* DeleteLazyProperty(LookupResult* result, String* name); |
| |
| // Tests for the fast common case for property enumeration. |
| bool IsSimpleEnum(); |
| |
| // Do we want to keep the elements in fast case when increasing the |
| // capacity? |
| bool ShouldConvertToSlowElements(int new_capacity); |
| // Returns true if the backing storage for the slow-case elements of |
| // this object takes up nearly as much space as a fast-case backing |
| // storage would. In that case the JSObject should have fast |
| // elements. |
| bool ShouldConvertToFastElements(); |
| |
| // Return the object's prototype (might be Heap::null_value()). |
| inline Object* GetPrototype(); |
| |
| // Tells whether the index'th element is present. |
| inline bool HasElement(uint32_t index); |
| bool HasElementWithReceiver(JSObject* receiver, uint32_t index); |
| bool HasLocalElement(uint32_t index); |
| |
| bool HasElementWithInterceptor(JSObject* receiver, uint32_t index); |
| bool HasElementPostInterceptor(JSObject* receiver, uint32_t index); |
| |
| Object* SetFastElement(uint32_t index, Object* value); |
| |
| // Set the index'th array element. |
| // A Failure object is returned if GC is needed. |
| Object* SetElement(uint32_t index, Object* value); |
| |
| // Returns the index'th element. |
| // The undefined object if index is out of bounds. |
| Object* GetElementWithReceiver(JSObject* receiver, uint32_t index); |
| |
| void SetFastElements(FixedArray* elements); |
| Object* SetSlowElements(Object* length); |
| |
| // Lookup interceptors are used for handling properties controlled by host |
| // objects. |
| inline bool HasNamedInterceptor(); |
| inline bool HasIndexedInterceptor(); |
| |
| // Support functions for v8 api (needed for correct interceptor behavior). |
| bool HasRealNamedProperty(String* key); |
| bool HasRealElementProperty(uint32_t index); |
| bool HasRealNamedCallbackProperty(String* key); |
| |
| // Initializes the array to a certain length |
| Object* SetElementsLength(Object* length); |
| |
| // Get the header size for a JSObject. Used to compute the index of |
| // internal fields as well as the number of internal fields. |
| inline int GetHeaderSize(); |
| |
| inline int GetInternalFieldCount(); |
| inline Object* GetInternalField(int index); |
| inline void SetInternalField(int index, Object* value); |
| |
| // Lookup a property. If found, the result is valid and has |
| // detailed information. |
| void LocalLookup(String* name, LookupResult* result); |
| void Lookup(String* name, LookupResult* result); |
| |
| // The following lookup functions skip interceptors. |
| void LocalLookupRealNamedProperty(String* name, LookupResult* result); |
| void LookupRealNamedProperty(String* name, LookupResult* result); |
| void LookupRealNamedPropertyInPrototypes(String* name, LookupResult* result); |
| void LookupCallbackSetterInPrototypes(String* name, LookupResult* result); |
| Object* LookupCallbackSetterInPrototypes(uint32_t index); |
| void LookupCallback(String* name, LookupResult* result); |
| |
| // Returns the number of properties on this object filtering out properties |
| // with the specified attributes (ignoring interceptors). |
| int NumberOfLocalProperties(PropertyAttributes filter); |
| // Returns the number of enumerable properties (ignoring interceptors). |
| int NumberOfEnumProperties(); |
| // Fill in details for properties into storage starting at the specified |
| // index. |
| void GetLocalPropertyNames(FixedArray* storage, int index); |
| |
| // Returns the number of properties on this object filtering out properties |
| // with the specified attributes (ignoring interceptors). |
| int NumberOfLocalElements(PropertyAttributes filter); |
| // Returns the number of enumerable elements (ignoring interceptors). |
| int NumberOfEnumElements(); |
| // Returns the number of elements on this object filtering out elements |
| // with the specified attributes (ignoring interceptors). |
| int GetLocalElementKeys(FixedArray* storage, PropertyAttributes filter); |
| // Count and fill in the enumerable elements into storage. |
| // (storage->length() == NumberOfEnumElements()). |
| // If storage is NULL, will count the elements without adding |
| // them to any storage. |
| // Returns the number of enumerable elements. |
| int GetEnumElementKeys(FixedArray* storage); |
| |
| // Add a property to a fast-case object using a map transition to |
| // new_map. |
| Object* AddFastPropertyUsingMap(Map* new_map, |
| String* name, |
| Object* value); |
| |
| // Add a constant function property to a fast-case object. |
| // This leaves a CONSTANT_TRANSITION in the old map, and |
| // if it is called on a second object with this map, a |
| // normal property is added instead, with a map transition. |
| // This avoids the creation of many maps with the same constant |
| // function, all orphaned. |
| Object* AddConstantFunctionProperty(String* name, |
| JSFunction* function, |
| PropertyAttributes attributes); |
| |
| Object* ReplaceSlowProperty(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Converts a descriptor of any other type to a real field, |
| // backed by the properties array. Descriptors of visible |
| // types, such as CONSTANT_FUNCTION, keep their enumeration order. |
| // Converts the descriptor on the original object's map to a |
| // map transition, and the the new field is on the object's new map. |
| Object* ConvertDescriptorToFieldAndMapTransition( |
| String* name, |
| Object* new_value, |
| PropertyAttributes attributes); |
| |
| // Converts a descriptor of any other type to a real field, |
| // backed by the properties array. Descriptors of visible |
| // types, such as CONSTANT_FUNCTION, keep their enumeration order. |
| Object* ConvertDescriptorToField(String* name, |
| Object* new_value, |
| PropertyAttributes attributes); |
| |
| // Add a property to a fast-case object. |
| Object* AddFastProperty(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Add a property to a slow-case object. |
| Object* AddSlowProperty(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Add a property to an object. |
| Object* AddProperty(String* name, |
| Object* value, |
| PropertyAttributes attributes); |
| |
| // Convert the object to use the canonical dictionary |
| // representation. |
| Object* NormalizeProperties(PropertyNormalizationMode mode); |
| Object* NormalizeElements(); |
| |
| // Transform slow named properties to fast variants. |
| // Returns failure if allocation failed. |
| Object* TransformToFastProperties(int unused_property_fields); |
| |
| // Access fast-case object properties at index. |
| inline Object* FastPropertyAt(int index); |
| inline Object* FastPropertyAtPut(int index, Object* value); |
| |
| // Access to in object properties. |
| inline Object* InObjectPropertyAt(int index); |
| inline Object* InObjectPropertyAtPut(int index, |
| Object* value, |
| WriteBarrierMode mode |
| = UPDATE_WRITE_BARRIER); |
| |
| // initializes the body after properties slot, properties slot is |
| // initialized by set_properties |
| // Note: this call does not update write barrier, it is caller's |
| // reponsibility to ensure that *v* can be collected without WB here. |
| inline void InitializeBody(int object_size); |
| |
| // Check whether this object references another object |
| bool ReferencesObject(Object* obj); |
| |
| // Casting. |
| static inline JSObject* cast(Object* obj); |
| |
| // Dispatched behavior. |
| void JSObjectIterateBody(int object_size, ObjectVisitor* v); |
| void JSObjectShortPrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void JSObjectPrint(); |
| void JSObjectVerify(); |
| void PrintProperties(); |
| void PrintElements(); |
| |
| // Structure for collecting spill information about JSObjects. |
| class SpillInformation { |
| public: |
| void Clear(); |
| void Print(); |
| int number_of_objects_; |
| int number_of_objects_with_fast_properties_; |
| int number_of_objects_with_fast_elements_; |
| int number_of_fast_used_fields_; |
| int number_of_fast_unused_fields_; |
| int number_of_slow_used_properties_; |
| int number_of_slow_unused_properties_; |
| int number_of_fast_used_elements_; |
| int number_of_fast_unused_elements_; |
| int number_of_slow_used_elements_; |
| int number_of_slow_unused_elements_; |
| }; |
| |
| void IncrementSpillStatistics(SpillInformation* info); |
| #endif |
| Object* SlowReverseLookup(Object* value); |
| |
| static const uint32_t kMaxGap = 1024; |
| static const int kMaxFastElementsLength = 5000; |
| static const int kInitialMaxFastElementArray = 100000; |
| static const int kMaxFastProperties = 8; |
| static const int kMaxInstanceSize = 255 * kPointerSize; |
| // When extending the backing storage for property values, we increase |
| // its size by more than the 1 entry necessary, so sequentially adding fields |
| // to the same object requires fewer allocations and copies. |
| static const int kFieldsAdded = 3; |
| |
| // Layout description. |
| static const int kPropertiesOffset = HeapObject::kHeaderSize; |
| static const int kElementsOffset = kPropertiesOffset + kPointerSize; |
| static const int kHeaderSize = kElementsOffset + kPointerSize; |
| |
| Object* GetElementWithInterceptor(JSObject* receiver, uint32_t index); |
| |
| private: |
| Object* SetElementWithInterceptor(uint32_t index, Object* value); |
| Object* SetElementPostInterceptor(uint32_t index, Object* value); |
| |
| Object* GetElementPostInterceptor(JSObject* receiver, uint32_t index); |
| |
| Object* DeletePropertyPostInterceptor(String* name); |
| Object* DeletePropertyWithInterceptor(String* name); |
| |
| Object* DeleteElementPostInterceptor(uint32_t index); |
| Object* DeleteElementWithInterceptor(uint32_t index); |
| |
| PropertyAttributes GetPropertyAttributePostInterceptor(JSObject* receiver, |
| String* name, |
| bool continue_search); |
| PropertyAttributes GetPropertyAttributeWithInterceptor(JSObject* receiver, |
| String* name, |
| bool continue_search); |
| PropertyAttributes GetPropertyAttributeWithFailedAccessCheck( |
| Object* receiver, |
| LookupResult* result, |
| String* name, |
| bool continue_search); |
| PropertyAttributes GetPropertyAttribute(JSObject* receiver, |
| LookupResult* result, |
| String* name, |
| bool continue_search); |
| |
| // Returns true if most of the elements backing storage is used. |
| bool HasDenseElements(); |
| |
| Object* DefineGetterSetter(String* name, PropertyAttributes attributes); |
| |
| void LookupInDescriptor(String* name, LookupResult* result); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject); |
| }; |
| |
| |
| // Abstract super class arrays. It provides length behavior. |
| class Array: public HeapObject { |
| public: |
| // [length]: length of the array. |
| inline int length(); |
| inline void set_length(int value); |
| |
| // Convert an object to an array index. |
| // Returns true if the conversion succeeded. |
| static inline bool IndexFromObject(Object* object, uint32_t* index); |
| |
| // Layout descriptor. |
| static const int kLengthOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = kLengthOffset + kIntSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Array); |
| }; |
| |
| |
| // FixedArray describes fixed sized arrays where element |
| // type is Object*. |
| |
| class FixedArray: public Array { |
| public: |
| |
| // Setter and getter for elements. |
| inline Object* get(int index); |
| // Setter that uses write barrier. |
| inline void set(int index, Object* value); |
| |
| // Setter that doesn't need write barrier). |
| inline void set(int index, Smi* value); |
| // Setter with explicit barrier mode. |
| inline void set(int index, Object* value, WriteBarrierMode mode); |
| |
| // Setters for frequently used oddballs located in old space. |
| inline void set_undefined(int index); |
| inline void set_null(int index); |
| inline void set_the_hole(int index); |
| |
| // Copy operations. |
| inline Object* Copy(); |
| Object* CopySize(int new_length); |
| |
| // Add the elements of a JSArray to this FixedArray. |
| Object* AddKeysFromJSArray(JSArray* array); |
| |
| // Compute the union of this and other. |
| Object* UnionOfKeys(FixedArray* other); |
| |
| // Copy a sub array from the receiver to dest. |
| void CopyTo(int pos, FixedArray* dest, int dest_pos, int len); |
| |
| // Garbage collection support. |
| static int SizeFor(int length) { return kHeaderSize + length * kPointerSize; } |
| |
| // Casting. |
| static inline FixedArray* cast(Object* obj); |
| |
| // Dispatched behavior. |
| int FixedArraySize() { return SizeFor(length()); } |
| void FixedArrayIterateBody(ObjectVisitor* v); |
| #ifdef DEBUG |
| void FixedArrayPrint(); |
| void FixedArrayVerify(); |
| // Checks if two FixedArrays have identical contents. |
| bool IsEqualTo(FixedArray* other); |
| #endif |
| |
| // Swap two elements in a pair of arrays. If this array and the |
| // numbers array are the same object, the elements are only swapped |
| // once. |
| void SwapPairs(FixedArray* numbers, int i, int j); |
| |
| // Sort prefix of this array and the numbers array as pairs wrt. the |
| // numbers. If the numbers array and the this array are the same |
| // object, the prefix of this array is sorted. |
| void SortPairs(FixedArray* numbers, uint32_t len); |
| |
| protected: |
| // Set operation on FixedArray without using write barriers. |
| static inline void fast_set(FixedArray* array, int index, Object* value); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedArray); |
| }; |
| |
| |
| // DescriptorArrays are fixed arrays used to hold instance descriptors. |
| // The format of the these objects is: |
| // [0]: point to a fixed array with (value, detail) pairs. |
| // [1]: next enumeration index (Smi), or pointer to small fixed array: |
| // [0]: next enumeration index (Smi) |
| // [1]: pointer to fixed array with enum cache |
| // [2]: first key |
| // [length() - 1]: last key |
| // |
| class DescriptorArray: public FixedArray { |
| public: |
| // Is this the singleton empty_descriptor_array? |
| inline bool IsEmpty(); |
| // Returns the number of descriptors in the array. |
| int number_of_descriptors() { |
| return IsEmpty() ? 0 : length() - kFirstIndex; |
| } |
| |
| int NextEnumerationIndex() { |
| if (IsEmpty()) return PropertyDetails::kInitialIndex; |
| Object* obj = get(kEnumerationIndexIndex); |
| if (obj->IsSmi()) { |
| return Smi::cast(obj)->value(); |
| } else { |
| Object* index = FixedArray::cast(obj)->get(kEnumCacheBridgeEnumIndex); |
| return Smi::cast(index)->value(); |
| } |
| } |
| |
| // Set next enumeration index and flush any enum cache. |
| void SetNextEnumerationIndex(int value) { |
| if (!IsEmpty()) { |
| fast_set(this, kEnumerationIndexIndex, Smi::FromInt(value)); |
| } |
| } |
| bool HasEnumCache() { |
| return !IsEmpty() && !get(kEnumerationIndexIndex)->IsSmi(); |
| } |
| |
| Object* GetEnumCache() { |
| ASSERT(HasEnumCache()); |
| FixedArray* bridge = FixedArray::cast(get(kEnumerationIndexIndex)); |
| return bridge->get(kEnumCacheBridgeCacheIndex); |
| } |
| |
| // Initialize or change the enum cache, |
| // using the supplied storage for the small "bridge". |
| void SetEnumCache(FixedArray* bridge_storage, FixedArray* new_cache); |
| |
| // Accessors for fetching instance descriptor at descriptor number.. |
| inline String* GetKey(int descriptor_number); |
| inline Object* GetValue(int descriptor_number); |
| inline Smi* GetDetails(int descriptor_number); |
| |
| // Accessor for complete descriptor. |
| inline void Get(int descriptor_number, Descriptor* desc); |
| inline void Set(int descriptor_number, Descriptor* desc); |
| |
| // Copy the descriptor array, insert a new descriptor and optionally |
| // remove map transitions. If the descriptor is already present, it is |
| // replaced. If a replaced descriptor is a real property (not a transition |
| // or null), its enumeration index is kept as is. |
| // If adding a real property, map transitions must be removed. If adding |
| // a transition, they must not be removed. All null descriptors are removed. |
| Object* CopyInsert(Descriptor* descriptor, TransitionFlag transition_flag); |
| |
| // Remove all transitions. Return a copy of the array with all transitions |
| // removed, or a Failure object if the new array could not be allocated. |
| Object* RemoveTransitions(); |
| |
| // Sort the instance descriptors by the hash codes of their keys. |
| void Sort(); |
| |
| // Search the instance descriptors for given name. |
| inline int Search(String* name); |
| |
| // Tells whether the name is present int the array. |
| bool Contains(String* name) { return kNotFound != Search(name); } |
| |
| // Perform a binary search in the instance descriptors represented |
| // by this fixed array. low and high are descriptor indices. If there |
| // are three instance descriptors in this array it should be called |
| // with low=0 and high=2. |
| int BinarySearch(String* name, int low, int high); |
| |
| // Perform a linear search in the instance descriptors represented |
| // by this fixed array. len is the number of descriptor indices that are |
| // valid. Does not require the descriptors to be sorted. |
| int LinearSearch(String* name, int len); |
| |
| // Allocates a DescriptorArray, but returns the singleton |
| // empty descriptor array object if number_of_descriptors is 0. |
| static Object* Allocate(int number_of_descriptors); |
| |
| // Casting. |
| static inline DescriptorArray* cast(Object* obj); |
| |
| // Constant for denoting key was not found. |
| static const int kNotFound = -1; |
| |
| static const int kContentArrayIndex = 0; |
| static const int kEnumerationIndexIndex = 1; |
| static const int kFirstIndex = 2; |
| |
| // The length of the "bridge" to the enum cache. |
| static const int kEnumCacheBridgeLength = 2; |
| static const int kEnumCacheBridgeEnumIndex = 0; |
| static const int kEnumCacheBridgeCacheIndex = 1; |
| |
| // Layout description. |
| static const int kContentArrayOffset = FixedArray::kHeaderSize; |
| static const int kEnumerationIndexOffset = kContentArrayOffset + kPointerSize; |
| static const int kFirstOffset = kEnumerationIndexOffset + kPointerSize; |
| |
| // Layout description for the bridge array. |
| static const int kEnumCacheBridgeEnumOffset = FixedArray::kHeaderSize; |
| static const int kEnumCacheBridgeCacheOffset = |
| kEnumCacheBridgeEnumOffset + kPointerSize; |
| |
| #ifdef DEBUG |
| // Print all the descriptors. |
| void PrintDescriptors(); |
| |
| // Is the descriptor array sorted and without duplicates? |
| bool IsSortedNoDuplicates(); |
| |
| // Are two DescriptorArrays equal? |
| bool IsEqualTo(DescriptorArray* other); |
| #endif |
| |
| // The maximum number of descriptors we want in a descriptor array (should |
| // fit in a page). |
| static const int kMaxNumberOfDescriptors = 1024 + 512; |
| |
| private: |
| // Conversion from descriptor number to array indices. |
| static int ToKeyIndex(int descriptor_number) { |
| return descriptor_number+kFirstIndex; |
| } |
| static int ToValueIndex(int descriptor_number) { |
| return descriptor_number << 1; |
| } |
| static int ToDetailsIndex(int descriptor_number) { |
| return( descriptor_number << 1) + 1; |
| } |
| |
| bool is_null_descriptor(int descriptor_number) { |
| return PropertyDetails(GetDetails(descriptor_number)).type() == |
| NULL_DESCRIPTOR; |
| } |
| // Swap operation on FixedArray without using write barriers. |
| static inline void fast_swap(FixedArray* array, int first, int second); |
| |
| // Swap descriptor first and second. |
| inline void Swap(int first, int second); |
| |
| FixedArray* GetContentArray() { |
| return FixedArray::cast(get(kContentArrayIndex)); |
| } |
| DISALLOW_IMPLICIT_CONSTRUCTORS(DescriptorArray); |
| }; |
| |
| |
| // HashTable is a subclass of FixedArray that implements a hash table |
| // that uses open addressing and quadratic probing. |
| // |
| // In order for the quadratic probing to work, elements that have not |
| // yet been used and elements that have been deleted are |
| // distinguished. Probing continues when deleted elements are |
| // encountered and stops when unused elements are encountered. |
| // |
| // - Elements with key == undefined have not been used yet. |
| // - Elements with key == null have been deleted. |
| // |
| // The hash table class is parameterized with a prefix size and with |
| // the size, including the key size, of the elements held in the hash |
| // table. The prefix size indicates an amount of memory in the |
| // beginning of the backing storage that can be used for non-element |
| // information by subclasses. |
| |
| // HashTableKey is an abstract superclass keys. |
| class HashTableKey { |
| public: |
| // Returns whether the other object matches this key. |
| virtual bool IsMatch(Object* other) = 0; |
| typedef uint32_t (*HashFunction)(Object* obj); |
| // Returns the hash function used for this key. |
| virtual HashFunction GetHashFunction() = 0; |
| // Returns the hash value for this key. |
| virtual uint32_t Hash() = 0; |
| // Returns the key object for storing into the dictionary. |
| // If allocations fails a failure object is returned. |
| virtual Object* GetObject() = 0; |
| virtual bool IsStringKey() = 0; |
| // Required. |
| virtual ~HashTableKey() {} |
| }; |
| |
| |
| template<int prefix_size, int element_size> |
| class HashTable: public FixedArray { |
| public: |
| // Returns the number of elements in the dictionary. |
| int NumberOfElements() { |
| return Smi::cast(get(kNumberOfElementsIndex))->value(); |
| } |
| |
| // Returns the capacity of the dictionary. |
| int Capacity() { |
| return Smi::cast(get(kCapacityIndex))->value(); |
| } |
| |
| // ElementAdded should be called whenever an element is added to a |
| // dictionary. |
| void ElementAdded() { SetNumberOfElements(NumberOfElements() + 1); } |
| |
| // ElementRemoved should be called whenever an element is removed from |
| // a dictionary. |
| void ElementRemoved() { SetNumberOfElements(NumberOfElements() - 1); } |
| void ElementsRemoved(int n) { SetNumberOfElements(NumberOfElements() - n); } |
| |
| // Returns a new array for dictionary usage. Might return Failure. |
| static Object* Allocate(int at_least_space_for); |
| |
| // Returns the key at entry. |
| Object* KeyAt(int entry) { return get(EntryToIndex(entry)); } |
| |
| // Tells whether k is a real key. Null and undefined are not allowed |
| // as keys and can be used to indicate missing or deleted elements. |
| bool IsKey(Object* k) { |
| return !k->IsNull() && !k->IsUndefined(); |
| } |
| |
| // Garbage collection support. |
| void IteratePrefix(ObjectVisitor* visitor); |
| void IterateElements(ObjectVisitor* visitor); |
| |
| // Casting. |
| static inline HashTable* cast(Object* obj); |
| |
| // Compute the probe offset (quadratic probing). |
| INLINE(static uint32_t GetProbeOffset(uint32_t n)) { |
| return (n + n * n) >> 1; |
| } |
| |
| static const int kNumberOfElementsIndex = 0; |
| static const int kCapacityIndex = 1; |
| static const int kPrefixStartIndex = 2; |
| static const int kElementsStartIndex = kPrefixStartIndex + prefix_size; |
| static const int kElementSize = element_size; |
| static const int kElementsStartOffset = |
| kHeaderSize + kElementsStartIndex * kPointerSize; |
| |
| protected: |
| // Find entry for key otherwise return -1. |
| int FindEntry(HashTableKey* key); |
| |
| // Find the entry at which to insert element with the given key that |
| // has the given hash value. |
| uint32_t FindInsertionEntry(Object* key, uint32_t hash); |
| |
| // Returns the index for an entry (of the key) |
| static inline int EntryToIndex(int entry) { |
| return (entry * kElementSize) + kElementsStartIndex; |
| } |
| |
| // Update the number of elements in the dictionary. |
| void SetNumberOfElements(int nof) { |
| fast_set(this, kNumberOfElementsIndex, Smi::FromInt(nof)); |
| } |
| |
| // Sets the capacity of the hash table. |
| void SetCapacity(int capacity) { |
| // To scale a computed hash code to fit within the hash table, we |
| // use bit-wise AND with a mask, so the capacity must be positive |
| // and non-zero. |
| ASSERT(capacity > 0); |
| fast_set(this, kCapacityIndex, Smi::FromInt(capacity)); |
| } |
| |
| |
| // Returns probe entry. |
| static uint32_t GetProbe(uint32_t hash, uint32_t number, uint32_t size) { |
| ASSERT(IsPowerOf2(size)); |
| return (hash + GetProbeOffset(number)) & (size - 1); |
| } |
| |
| // Ensure enough space for n additional elements. |
| Object* EnsureCapacity(int n, HashTableKey* key); |
| }; |
| |
| |
| // SymbolTable. |
| // |
| // No special elements in the prefix and the element size is 1 |
| // because only the symbol itself (the key) needs to be stored. |
| class SymbolTable: public HashTable<0, 1> { |
| public: |
| // Find symbol in the symbol table. If it is not there yet, it is |
| // added. The return value is the symbol table which might have |
| // been enlarged. If the return value is not a failure, the symbol |
| // pointer *s is set to the symbol found. |
| Object* LookupSymbol(Vector<const char> str, Object** s); |
| Object* LookupString(String* key, Object** s); |
| |
| // Looks up a symbol that is equal to the given string and returns |
| // true if it is found, assigning the symbol to the given output |
| // parameter. |
| bool LookupSymbolIfExists(String* str, String** symbol); |
| |
| // Casting. |
| static inline SymbolTable* cast(Object* obj); |
| |
| private: |
| Object* LookupKey(HashTableKey* key, Object** s); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SymbolTable); |
| }; |
| |
| |
| // MapCache. |
| // |
| // Maps keys that are a fixed array of symbols to a map. |
| // Used for canonicalize maps for object literals. |
| class MapCache: public HashTable<0, 2> { |
| public: |
| // Find cached value for a string key, otherwise return null. |
| Object* Lookup(FixedArray* key); |
| Object* Put(FixedArray* key, Map* value); |
| static inline MapCache* cast(Object* obj); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(MapCache); |
| }; |
| |
| |
| // LookupCache. |
| // |
| // Maps a key consisting of a map and a name to an index within a |
| // fast-case properties array. |
| // |
| // LookupCaches are used to avoid repeatedly searching instance |
| // descriptors. |
| class LookupCache: public HashTable<0, 2> { |
| public: |
| int Lookup(Map* map, String* name); |
| Object* Put(Map* map, String* name, int offset); |
| static inline LookupCache* cast(Object* obj); |
| |
| // Constant returned by Lookup when the key was not found. |
| static const int kNotFound = -1; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(LookupCache); |
| }; |
| |
| |
| // Dictionary for keeping properties and elements in slow case. |
| // |
| // One element in the prefix is used for storing non-element |
| // information about the dictionary. |
| // |
| // The rest of the array embeds triples of (key, value, details). |
| // if key == undefined the triple is empty. |
| // if key == null the triple has been deleted. |
| // otherwise key contains the name of a property. |
| class DictionaryBase: public HashTable<2, 3> {}; |
| |
| class Dictionary: public DictionaryBase { |
| public: |
| // Returns the value at entry. |
| Object* ValueAt(int entry) { return get(EntryToIndex(entry)+1); } |
| |
| // Set the value for entry. |
| void ValueAtPut(int entry, Object* value) { |
| set(EntryToIndex(entry)+1, value); |
| } |
| |
| // Returns the property details for the property at entry. |
| PropertyDetails DetailsAt(int entry) { |
| return PropertyDetails(Smi::cast(get(EntryToIndex(entry) + 2))); |
| } |
| |
| // Set the details for entry. |
| void DetailsAtPut(int entry, PropertyDetails value) { |
| set(EntryToIndex(entry) + 2, value.AsSmi()); |
| } |
| |
| // Remove all entries were key is a number and (from <= key && key < to). |
| void RemoveNumberEntries(uint32_t from, uint32_t to); |
| |
| // Sorting support |
| void CopyValuesTo(FixedArray* elements); |
| |
| // Casting. |
| static inline Dictionary* cast(Object* obj); |
| |
| // Find entry for string key otherwise return -1. |
| int FindStringEntry(String* key); |
| |
| // Find entry for number key otherwise return -1. |
| int FindNumberEntry(uint32_t index); |
| |
| // Delete a property from the dictionary. |
| Object* DeleteProperty(int entry); |
| |
| // Type specific at put (default NONE attributes is used when adding). |
| Object* AtStringPut(String* key, Object* value); |
| Object* AtNumberPut(uint32_t key, Object* value); |
| |
| Object* AddStringEntry(String* key, Object* value, PropertyDetails details); |
| Object* AddNumberEntry(uint32_t key, Object* value, PropertyDetails details); |
| |
| // Set an existing entry or add a new one if needed. |
| Object* SetOrAddStringEntry(String* key, |
| Object* value, |
| PropertyDetails details); |
| |
| Object* SetOrAddNumberEntry(uint32_t key, |
| Object* value, |
| PropertyDetails details); |
| |
| // Returns the number of elements in the dictionary filtering out properties |
| // with the specified attributes. |
| int NumberOfElementsFilterAttributes(PropertyAttributes filter); |
| |
| // Returns the number of enumerable elements in the dictionary. |
| int NumberOfEnumElements(); |
| |
| // Copies keys to preallocated fixed array. |
| void CopyKeysTo(FixedArray* storage, PropertyAttributes filter); |
| // Copies enumerable keys to preallocated fixed array. |
| void CopyEnumKeysTo(FixedArray* storage, FixedArray* sort_array); |
| // Fill in details for properties into storage. |
| void CopyKeysTo(FixedArray* storage); |
| |
| // For transforming properties of a JSObject. |
| Object* TransformPropertiesToFastFor(JSObject* obj, |
| int unused_property_fields); |
| |
| // If slow elements are required we will never go back to fast-case |
| // for the elements kept in this dictionary. We require slow |
| // elements if an element has been added at an index larger than |
| // kRequiresSlowElementsLimit or set_requires_slow_elements() has been called |
| // when defining a getter or setter with a number key. |
| inline bool requires_slow_elements(); |
| inline void set_requires_slow_elements(); |
| |
| // Get the value of the max number key that has been added to this |
| // dictionary. max_number_key can only be called if |
| // requires_slow_elements returns false. |
| inline uint32_t max_number_key(); |
| |
| // Accessors for next enumeration index. |
| void SetNextEnumerationIndex(int index) { |
| fast_set(this, kNextEnumerationIndexIndex, Smi::FromInt(index)); |
| } |
| |
| int NextEnumerationIndex() { |
| return Smi::cast(get(kNextEnumerationIndexIndex))->value(); |
| } |
| |
| // Returns a new array for dictionary usage. Might return Failure. |
| static Object* Allocate(int at_least_space_for); |
| |
| // Ensure enough space for n additional elements. |
| Object* EnsureCapacity(int n, HashTableKey* key); |
| |
| #ifdef DEBUG |
| void Print(); |
| #endif |
| // Returns the key (slow). |
| Object* SlowReverseLookup(Object* value); |
| |
| // Bit masks. |
| static const int kRequiresSlowElementsMask = 1; |
| static const int kRequiresSlowElementsTagSize = 1; |
| static const uint32_t kRequiresSlowElementsLimit = (1 << 29) - 1; |
| |
| void UpdateMaxNumberKey(uint32_t key); |
| |
| private: |
| // Generic at put operation. |
| Object* AtPut(HashTableKey* key, Object* value); |
| |
| Object* Add(HashTableKey* key, Object* value, PropertyDetails details); |
| |
| // Add entry to dictionary. |
| void AddEntry(Object* key, |
| Object* value, |
| PropertyDetails details, |
| uint32_t hash); |
| |
| // Sets the entry to (key, value) pair. |
| inline void SetEntry(int entry, |
| Object* key, |
| Object* value, |
| PropertyDetails details); |
| |
| // Generate new enumeration indices to avoid enumeration index overflow. |
| Object* GenerateNewEnumerationIndices(); |
| |
| static const int kMaxNumberKeyIndex = kPrefixStartIndex; |
| static const int kNextEnumerationIndexIndex = kMaxNumberKeyIndex + 1; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Dictionary); |
| }; |
| |
| |
| // ByteArray represents fixed sized byte arrays. Used by the outside world, |
| // such as PCRE, and also by the memory allocator and garbage collector to |
| // fill in free blocks in the heap. |
| class ByteArray: public Array { |
| public: |
| // Setter and getter. |
| inline byte get(int index); |
| inline void set(int index, byte value); |
| |
| // Treat contents as an int array. |
| inline int get_int(int index); |
| |
| static int SizeFor(int length) { |
| return kHeaderSize + OBJECT_SIZE_ALIGN(length); |
| } |
| // We use byte arrays for free blocks in the heap. Given a desired size in |
| // bytes that is a multiple of the word size and big enough to hold a byte |
| // array, this function returns the number of elements a byte array should |
| // have. |
| static int LengthFor(int size_in_bytes) { |
| ASSERT(IsAligned(size_in_bytes, kPointerSize)); |
| ASSERT(size_in_bytes >= kHeaderSize); |
| return size_in_bytes - kHeaderSize; |
| } |
| |
| // Returns data start address. |
| inline Address GetDataStartAddress(); |
| |
| // Returns a pointer to the ByteArray object for a given data start address. |
| static inline ByteArray* FromDataStartAddress(Address address); |
| |
| // Casting. |
| static inline ByteArray* cast(Object* obj); |
| |
| // Dispatched behavior. |
| int ByteArraySize() { return SizeFor(length()); } |
| #ifdef DEBUG |
| void ByteArrayPrint(); |
| void ByteArrayVerify(); |
| #endif |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray); |
| }; |
| |
| |
| // Code describes objects with on-the-fly generated machine code. |
| class Code: public HeapObject { |
| public: |
| // Opaque data type for encapsulating code flags like kind, inline |
| // cache state, and arguments count. |
| enum Flags { }; |
| |
| enum Kind { |
| FUNCTION, |
| STUB, |
| BUILTIN, |
| LOAD_IC, |
| KEYED_LOAD_IC, |
| CALL_IC, |
| STORE_IC, |
| KEYED_STORE_IC, |
| // No more than eight kinds. The value currently encoded in three bits in |
| // Flags. |
| |
| // Pseudo-kinds. |
| REGEXP = BUILTIN, |
| FIRST_IC_KIND = LOAD_IC, |
| LAST_IC_KIND = KEYED_STORE_IC |
| }; |
| |
| enum { |
| NUMBER_OF_KINDS = KEYED_STORE_IC + 1 |
| }; |
| |
| // A state indicates that inline cache in this Code object contains |
| // objects or relative instruction addresses. |
| enum ICTargetState { |
| IC_TARGET_IS_ADDRESS, |
| IC_TARGET_IS_OBJECT |
| }; |
| |
| #ifdef ENABLE_DISASSEMBLER |
| // Printing |
| static const char* Kind2String(Kind kind); |
| static const char* ICState2String(InlineCacheState state); |
| void Disassemble(const char* name); |
| #endif // ENABLE_DISASSEMBLER |
| |
| // [instruction_size]: Size of the native instructions |
| inline int instruction_size(); |
| inline void set_instruction_size(int value); |
| |
| // [relocation_size]: Size of relocation information. |
| inline int relocation_size(); |
| inline void set_relocation_size(int value); |
| |
| // [sinfo_size]: Size of scope information. |
| inline int sinfo_size(); |
| inline void set_sinfo_size(int value); |
| |
| // [flags]: Various code flags. |
| inline Flags flags(); |
| inline void set_flags(Flags flags); |
| |
| // [flags]: Access to specific code flags. |
| inline Kind kind(); |
| inline InlineCacheState ic_state(); // only valid for IC stubs |
| inline PropertyType type(); // only valid for monomorphic IC stubs |
| inline int arguments_count(); // only valid for call IC stubs |
| |
| // Testers for IC stub kinds. |
| inline bool is_inline_cache_stub(); |
| inline bool is_load_stub() { return kind() == LOAD_IC; } |
| inline bool is_keyed_load_stub() { return kind() == KEYED_LOAD_IC; } |
| inline bool is_store_stub() { return kind() == STORE_IC; } |
| inline bool is_keyed_store_stub() { return kind() == KEYED_STORE_IC; } |
| inline bool is_call_stub() { return kind() == CALL_IC; } |
| |
| // [ic_flag]: State of inline cache targets. The flag is set to the |
| // object variant in ConvertICTargetsFromAddressToObject, and set to |
| // the address variant in ConvertICTargetsFromObjectToAddress. |
| inline ICTargetState ic_flag(); |
| inline void set_ic_flag(ICTargetState value); |
| |
| // [major_key]: For kind STUB, the major key. |
| inline CodeStub::Major major_key(); |
| inline void set_major_key(CodeStub::Major major); |
| |
| // Flags operations. |
| static inline Flags ComputeFlags(Kind kind, |
| InlineCacheState ic_state = UNINITIALIZED, |
| PropertyType type = NORMAL, |
| int argc = -1); |
| |
| static inline Flags ComputeMonomorphicFlags(Kind kind, |
| PropertyType type, |
| int argc = -1); |
| |
| static inline Kind ExtractKindFromFlags(Flags flags); |
| static inline InlineCacheState ExtractICStateFromFlags(Flags flags); |
| static inline PropertyType ExtractTypeFromFlags(Flags flags); |
| static inline int ExtractArgumentsCountFromFlags(Flags flags); |
| static inline Flags RemoveTypeFromFlags(Flags flags); |
| |
| // Convert a target address into a code object. |
| static inline Code* GetCodeFromTargetAddress(Address address); |
| |
| // Returns the address of the first instruction. |
| inline byte* instruction_start(); |
| |
| // Returns the size of the instructions, padding, and relocation information. |
| inline int body_size(); |
| |
| // Returns the address of the first relocation info (read backwards!). |
| inline byte* relocation_start(); |
| |
| // Code entry point. |
| inline byte* entry(); |
| |
| // Returns true if pc is inside this object's instructions. |
| inline bool contains(byte* pc); |
| |
| // Returns the address of the scope information. |
| inline byte* sinfo_start(); |
| |
| // Convert inline cache target from address to code object before GC. |
| void ConvertICTargetsFromAddressToObject(); |
| |
| // Convert inline cache target from code object to address after GC |
| void ConvertICTargetsFromObjectToAddress(); |
| |
| // Relocate the code by delta bytes. Called to signal that this code |
| // object has been moved by delta bytes. |
| void Relocate(int delta); |
| |
| // Migrate code described by desc. |
| void CopyFrom(const CodeDesc& desc); |
| |
| // Returns the object size for a given body and sinfo size (Used for |
| // allocation). |
| static int SizeFor(int body_size, int sinfo_size) { |
| ASSERT_SIZE_TAG_ALIGNED(body_size); |
| ASSERT_SIZE_TAG_ALIGNED(sinfo_size); |
| return RoundUp(kHeaderSize + body_size + sinfo_size, kCodeAlignment); |
| } |
| |
| // Calculate the size of the code object to report for log events. This takes |
| // the layout of the code object into account. |
| int ExecutableSize() { |
| // Check that the assumptions about the layout of the code object holds. |
| ASSERT_EQ(instruction_start() - address(), |
| Code::kHeaderSize); |
| return instruction_size() + Code::kHeaderSize; |
| } |
| |
| // Locating source position. |
| int SourcePosition(Address pc); |
| int SourceStatementPosition(Address pc); |
| |
| // Casting. |
| static inline Code* cast(Object* obj); |
| |
| // Dispatched behavior. |
| int CodeSize() { return SizeFor(body_size(), sinfo_size()); } |
| void CodeIterateBody(ObjectVisitor* v); |
| #ifdef DEBUG |
| void CodePrint(); |
| void CodeVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kInstructionSizeOffset = HeapObject::kHeaderSize; |
| static const int kRelocationSizeOffset = kInstructionSizeOffset + kIntSize; |
| static const int kSInfoSizeOffset = kRelocationSizeOffset + kIntSize; |
| static const int kFlagsOffset = kSInfoSizeOffset + kIntSize; |
| static const int kKindSpecificFlagsOffset = kFlagsOffset + kIntSize; |
| // Add filler objects to align the instruction start following right after |
| // the Code object header. |
| static const int kFiller6Offset = kKindSpecificFlagsOffset + kIntSize; |
| static const int kFiller7Offset = kFiller6Offset + kIntSize; |
| static const int kHeaderSize = kFiller7Offset + kIntSize; |
| |
| // Code entry points are aligned to 32 bytes. |
| static const int kCodeAlignment = 32; |
| |
| // Byte offsets within kKindSpecificFlagsOffset. |
| static const int kICFlagOffset = kKindSpecificFlagsOffset + 0; |
| static const int kStubMajorKeyOffset = kKindSpecificFlagsOffset + 1; |
| |
| // Flags layout. |
| static const int kFlagsICStateShift = 0; |
| static const int kFlagsKindShift = 3; |
| static const int kFlagsTypeShift = 6; |
| static const int kFlagsArgumentsCountShift = 9; |
| |
| static const int kFlagsICStateMask = 0x00000007; // 000000111 |
| static const int kFlagsKindMask = 0x00000038; // 000111000 |
| static const int kFlagsTypeMask = 0x000001C0; // 111000000 |
| static const int kFlagsArgumentsCountMask = 0xFFFFFE00; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Code); |
| }; |
| |
| |
| // All heap objects have a Map that describes their structure. |
| // A Map contains information about: |
| // - Size information about the object |
| // - How to iterate over an object (for garbage collection) |
| class Map: public HeapObject { |
| public: |
| // Instance size. |
| inline int instance_size(); |
| inline void set_instance_size(int value); |
| |
| // Count of properties allocated in the object. |
| inline int inobject_properties(); |
| inline void set_inobject_properties(int value); |
| |
| // Instance type. |
| inline InstanceType instance_type(); |
| inline void set_instance_type(InstanceType value); |
| |
| // Tells how many unused property fields are available in the |
| // instance (only used for JSObject in fast mode). |
| inline int unused_property_fields(); |
| inline void set_unused_property_fields(int value); |
| |
| // Bit field. |
| inline byte bit_field(); |
| inline void set_bit_field(byte value); |
| |
| // Bit field 2. |
| inline byte bit_field2(); |
| inline void set_bit_field2(byte value); |
| |
| // Tells whether the object in the prototype property will be used |
| // for instances created from this function. If the prototype |
| // property is set to a value that is not a JSObject, the prototype |
| // property will not be used to create instances of the function. |
| // See ECMA-262, 13.2.2. |
| inline void set_non_instance_prototype(bool value); |
| inline bool has_non_instance_prototype(); |
| |
| // Tells whether the instance with this map should be ignored by the |
| // __proto__ accessor. |
| inline void set_is_hidden_prototype() { |
| set_bit_field(bit_field() | (1 << kIsHiddenPrototype)); |
| } |
| |
| inline bool is_hidden_prototype() { |
| return ((1 << kIsHiddenPrototype) & bit_field()) != 0; |
| } |
| |
| // Tells whether the instance has a named interceptor. |
| inline void set_has_named_interceptor() { |
| set_bit_field(bit_field() | (1 << kHasNamedInterceptor)); |
| } |
| |
| inline bool has_named_interceptor() { |
| return ((1 << kHasNamedInterceptor) & bit_field()) != 0; |
| } |
| |
| // Tells whether the instance has a named interceptor. |
| inline void set_has_indexed_interceptor() { |
| set_bit_field(bit_field() | (1 << kHasIndexedInterceptor)); |
| } |
| |
| inline bool has_indexed_interceptor() { |
| return ((1 << kHasIndexedInterceptor) & bit_field()) != 0; |
| } |
| |
| // Tells whether the instance is undetectable. |
| // An undetectable object is a special class of JSObject: 'typeof' operator |
| // returns undefined, ToBoolean returns false. Otherwise it behaves like |
| // a normal JS object. It is useful for implementing undetectable |
| // document.all in Firefox & Safari. |
| // See https://bugzilla.mozilla.org/show_bug.cgi?id=248549. |
| inline void set_is_undetectable() { |
| set_bit_field(bit_field() | (1 << kIsUndetectable)); |
| } |
| |
| inline bool is_undetectable() { |
| return ((1 << kIsUndetectable) & bit_field()) != 0; |
| } |
| |
| inline void set_needs_loading(bool value) { |
| if (value) { |
| set_bit_field2(bit_field2() | (1 << kNeedsLoading)); |
| } else { |
| set_bit_field2(bit_field2() & ~(1 << kNeedsLoading)); |
| } |
| } |
| |
| // Does this object or function require a lazily loaded script to be |
| // run before being used? |
| inline bool needs_loading() { |
| return ((1 << kNeedsLoading) & bit_field2()) != 0; |
| } |
| |
| // Tells whether the instance has a call-as-function handler. |
| inline void set_has_instance_call_handler() { |
| set_bit_field(bit_field() | (1 << kHasInstanceCallHandler)); |
| } |
| |
| inline bool has_instance_call_handler() { |
| return ((1 << kHasInstanceCallHandler) & bit_field()) != 0; |
| } |
| |
| // Tells whether the instance needs security checks when accessing its |
| // properties. |
| inline void set_is_access_check_needed(bool access_check_needed); |
| inline bool is_access_check_needed(); |
| |
| // [prototype]: implicit prototype object. |
| DECL_ACCESSORS(prototype, Object) |
| |
| // [constructor]: points back to the function responsible for this map. |
| DECL_ACCESSORS(constructor, Object) |
| |
| // [instance descriptors]: describes the object. |
| DECL_ACCESSORS(instance_descriptors, DescriptorArray) |
| |
| // [stub cache]: contains stubs compiled for this map. |
| DECL_ACCESSORS(code_cache, FixedArray) |
| |
| // Returns a copy of the map. |
| Object* CopyDropDescriptors(); |
| |
| // Returns a copy of the map, with all transitions dropped from the |
| // instance descriptors. |
| Object* CopyDropTransitions(); |
| |
| // Returns the property index for name (only valid for FAST MODE). |
| int PropertyIndexFor(String* name); |
| |
| // Returns the next free property index (only valid for FAST MODE). |
| int NextFreePropertyIndex(); |
| |
| // Returns the number of properties described in instance_descriptors. |
| int NumberOfDescribedProperties(); |
| |
| // Casting. |
| static inline Map* cast(Object* obj); |
| |
| // Locate an accessor in the instance descriptor. |
| AccessorDescriptor* FindAccessor(String* name); |
| |
| // Code cache operations. |
| |
| // Clears the code cache. |
| inline void ClearCodeCache(); |
| |
| // Update code cache. |
| Object* UpdateCodeCache(String* name, Code* code); |
| |
| // Returns the found code or undefined if absent. |
| Object* FindInCodeCache(String* name, Code::Flags flags); |
| |
| // Returns the non-negative index of the code object if it is in the |
| // cache and -1 otherwise. |
| int IndexInCodeCache(Code* code); |
| |
| // Removes a code object from the code cache at the given index. |
| void RemoveFromCodeCache(int index); |
| |
| // For every transition in this map, makes the transition's |
| // target's prototype pointer point back to this map. |
| // This is undone in MarkCompactCollector::ClearNonLiveTransitions(). |
| void CreateBackPointers(); |
| |
| // Set all map transitions from this map to dead maps to null. |
| // Also, restore the original prototype on the targets of these |
| // transitions, so that we do not process this map again while |
| // following back pointers. |
| void ClearNonLiveTransitions(Object* real_prototype); |
| |
| // Dispatched behavior. |
| void MapIterateBody(ObjectVisitor* v); |
| #ifdef DEBUG |
| void MapPrint(); |
| void MapVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kInstanceSizesOffset = HeapObject::kHeaderSize; |
| static const int kInstanceAttributesOffset = kInstanceSizesOffset + kIntSize; |
| static const int kPrototypeOffset = kInstanceAttributesOffset + kIntSize; |
| static const int kConstructorOffset = kPrototypeOffset + kPointerSize; |
| static const int kInstanceDescriptorsOffset = |
| kConstructorOffset + kPointerSize; |
| static const int kCodeCacheOffset = kInstanceDescriptorsOffset + kPointerSize; |
| static const int kSize = kCodeCacheOffset + kIntSize; |
| |
| // Byte offsets within kInstanceSizesOffset. |
| static const int kInstanceSizeOffset = kInstanceSizesOffset + 0; |
| static const int kInObjectPropertiesOffset = kInstanceSizesOffset + 1; |
| // The bytes at positions 2 and 3 are not in use at the moment. |
| |
| // Byte offsets within kInstanceAttributesOffset attributes. |
| static const int kInstanceTypeOffset = kInstanceAttributesOffset + 0; |
| static const int kUnusedPropertyFieldsOffset = kInstanceAttributesOffset + 1; |
| static const int kBitFieldOffset = kInstanceAttributesOffset + 2; |
| static const int kBitField2Offset = kInstanceAttributesOffset + 3; |
| |
| // Bit positions for bit field. |
| static const int kUnused = 0; // To be used for marking recently used maps. |
| static const int kHasNonInstancePrototype = 1; |
| static const int kIsHiddenPrototype = 2; |
| static const int kHasNamedInterceptor = 3; |
| static const int kHasIndexedInterceptor = 4; |
| static const int kIsUndetectable = 5; |
| static const int kHasInstanceCallHandler = 6; |
| static const int kIsAccessCheckNeeded = 7; |
| |
| // Bit positions for but field 2 |
| static const int kNeedsLoading = 0; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Map); |
| }; |
| |
| |
| // An abstract superclass, a marker class really, for simple structure classes. |
| // It doesn't carry much functionality but allows struct classes to me |
| // identified in the type system. |
| class Struct: public HeapObject { |
| public: |
| inline void InitializeBody(int object_size); |
| static inline Struct* cast(Object* that); |
| }; |
| |
| |
| // Script types. |
| enum ScriptType { |
| SCRIPT_TYPE_NATIVE, |
| SCRIPT_TYPE_EXTENSION, |
| SCRIPT_TYPE_NORMAL |
| }; |
| |
| |
| // Script describes a script which has been added to the VM. |
| class Script: public Struct { |
| public: |
| // [source]: the script source. |
| DECL_ACCESSORS(source, Object) |
| |
| // [name]: the script name. |
| DECL_ACCESSORS(name, Object) |
| |
| // [id]: the script id. |
| DECL_ACCESSORS(id, Object) |
| |
| // [line_offset]: script line offset in resource from where it was extracted. |
| DECL_ACCESSORS(line_offset, Smi) |
| |
| // [column_offset]: script column offset in resource from where it was |
| // extracted. |
| DECL_ACCESSORS(column_offset, Smi) |
| |
| // [data]: additional data associated with this script. |
| DECL_ACCESSORS(data, Object) |
| |
| // [context_data]: context data for the context this script was compiled in. |
| DECL_ACCESSORS(context_data, Object) |
| |
| // [wrapper]: the wrapper cache. |
| DECL_ACCESSORS(wrapper, Proxy) |
| |
| // [type]: the script type. |
| DECL_ACCESSORS(type, Smi) |
| |
| // [line_ends]: array of line ends positions |
| DECL_ACCESSORS(line_ends, Object) |
| |
| static inline Script* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void ScriptPrint(); |
| void ScriptVerify(); |
| #endif |
| |
| static const int kSourceOffset = HeapObject::kHeaderSize; |
| static const int kNameOffset = kSourceOffset + kPointerSize; |
| static const int kLineOffsetOffset = kNameOffset + kPointerSize; |
| static const int kColumnOffsetOffset = kLineOffsetOffset + kPointerSize; |
| static const int kDataOffset = kColumnOffsetOffset + kPointerSize; |
| static const int kContextOffset = kDataOffset + kPointerSize; |
| static const int kWrapperOffset = kContextOffset + kPointerSize; |
| static const int kTypeOffset = kWrapperOffset + kPointerSize; |
| static const int kLineEndsOffset = kTypeOffset + kPointerSize; |
| static const int kIdOffset = kLineEndsOffset + kPointerSize; |
| static const int kSize = kIdOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Script); |
| }; |
| |
| |
| // SharedFunctionInfo describes the JSFunction information that can be |
| // shared by multiple instances of the function. |
| class SharedFunctionInfo: public HeapObject { |
| public: |
| // [name]: Function name. |
| DECL_ACCESSORS(name, Object) |
| |
| // [code]: Function code. |
| DECL_ACCESSORS(code, Code) |
| |
| // Returns if this function has been compiled to native code yet. |
| inline bool is_compiled(); |
| |
| // [length]: The function length - usually the number of declared parameters. |
| // Use up to 2^30 parameters. |
| inline int length(); |
| inline void set_length(int value); |
| |
| // [formal parameter count]: The declared number of parameters. |
| inline int formal_parameter_count(); |
| inline void set_formal_parameter_count(int value); |
| |
| // Set the formal parameter count so the function code will be |
| // called without using argument adaptor frames. |
| inline void DontAdaptArguments(); |
| |
| // [expected_nof_properties]: Expected number of properties for the function. |
| inline int expected_nof_properties(); |
| inline void set_expected_nof_properties(int value); |
| |
| // [instance class name]: class name for instances. |
| DECL_ACCESSORS(instance_class_name, Object) |
| |
| // [function data]: This field has been added for make benefit the API. |
| // In the long run we don't want all functions to have this field but |
| // we can fix that when we have a better model for storing hidden data |
| // on objects. |
| DECL_ACCESSORS(function_data, Object) |
| |
| // [script info]: Script from which the function originates. |
| DECL_ACCESSORS(script, Object) |
| |
| // [start_position_and_type]: Field used to store both the source code |
| // position, whether or not the function is a function expression, |
| // and whether or not the function is a toplevel function. The two |
| // least significants bit indicates whether the function is an |
| // expression and the rest contains the source code position. |
| inline int start_position_and_type(); |
| inline void set_start_position_and_type(int value); |
| |
| // [debug info]: Debug information. |
| DECL_ACCESSORS(debug_info, Object) |
| |
| // [inferred name]: Name inferred from variable or property |
| // assignment of this function. Used to facilitate debugging and |
| // profiling of JavaScript code written in OO style, where almost |
| // all functions are anonymous but are assigned to object |
| // properties. |
| DECL_ACCESSORS(inferred_name, String) |
| |
| // Position of the 'function' token in the script source. |
| inline int function_token_position(); |
| inline void set_function_token_position(int function_token_position); |
| |
| // Position of this function in the script source. |
| inline int start_position(); |
| inline void set_start_position(int start_position); |
| |
| // End position of this function in the script source. |
| inline int end_position(); |
| inline void set_end_position(int end_position); |
| |
| // Is this function a function expression in the source code. |
| inline bool is_expression(); |
| inline void set_is_expression(bool value); |
| |
| // Is this function a top-level function. Used for accessing the |
| // caller of functions. Top-level functions (scripts, evals) are |
| // returned as null; see JSFunction::GetCallerAccessor(...). |
| inline bool is_toplevel(); |
| inline void set_is_toplevel(bool value); |
| |
| // [source code]: Source code for the function. |
| bool HasSourceCode(); |
| Object* GetSourceCode(); |
| |
| // Dispatched behavior. |
| void SharedFunctionInfoIterateBody(ObjectVisitor* v); |
| // Set max_length to -1 for unlimited length. |
| void SourceCodePrint(StringStream* accumulator, int max_length); |
| #ifdef DEBUG |
| void SharedFunctionInfoPrint(); |
| void SharedFunctionInfoVerify(); |
| #endif |
| |
| // Casting. |
| static inline SharedFunctionInfo* cast(Object* obj); |
| |
| // Constants. |
| static const int kDontAdaptArgumentsSentinel = -1; |
| |
| // Layout description. |
| static const int kNameOffset = HeapObject::kHeaderSize; |
| static const int kCodeOffset = kNameOffset + kPointerSize; |
| static const int kLengthOffset = kCodeOffset + kPointerSize; |
| static const int kFormalParameterCountOffset = kLengthOffset + kIntSize; |
| static const int kExpectedNofPropertiesOffset = |
| kFormalParameterCountOffset + kIntSize; |
| static const int kInstanceClassNameOffset = |
| kExpectedNofPropertiesOffset + kIntSize; |
| static const int kExternalReferenceDataOffset = |
| kInstanceClassNameOffset + kPointerSize; |
| static const int kScriptOffset = kExternalReferenceDataOffset + kPointerSize; |
| static const int kStartPositionAndTypeOffset = kScriptOffset + kPointerSize; |
| static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize; |
| static const int kFunctionTokenPositionOffset = kEndPositionOffset + kIntSize; |
| static const int kDebugInfoOffset = kFunctionTokenPositionOffset + kIntSize; |
| static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize; |
| static const int kSize = kInferredNameOffset + kPointerSize; |
| |
| private: |
| // Bit positions in length_and_flg. |
| // The least significant bit is used as the flag. |
| static const int kFlagBit = 0; |
| static const int kLengthShift = 1; |
| static const int kLengthMask = ~((1 << kLengthShift) - 1); |
| |
| // Bit positions in start_position_and_type. |
| // The source code start position is in the 30 most significant bits of |
| // the start_position_and_type field. |
| static const int kIsExpressionBit = 0; |
| static const int kIsTopLevelBit = 1; |
| static const int kStartPositionShift = 2; |
| static const int kStartPositionMask = ~((1 << kStartPositionShift) - 1); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo); |
| }; |
| |
| |
| // JSFunction describes JavaScript functions. |
| class JSFunction: public JSObject { |
| public: |
| // [prototype_or_initial_map]: |
| DECL_ACCESSORS(prototype_or_initial_map, Object) |
| |
| // [shared_function_info]: The information about the function that |
| // can be shared by instances. |
| DECL_ACCESSORS(shared, SharedFunctionInfo) |
| |
| // [context]: The context for this function. |
| inline Context* context(); |
| inline Object* unchecked_context(); |
| inline void set_context(Object* context); |
| |
| // [code]: The generated code object for this function. Executed |
| // when the function is invoked, e.g. foo() or new foo(). See |
| // [[Call]] and [[Construct]] description in ECMA-262, section |
| // 8.6.2, page 27. |
| inline Code* code(); |
| inline void set_code(Code* value); |
| |
| // Tells whether this function is a context-independent boilerplate |
| // function. |
| inline bool IsBoilerplate(); |
| |
| // [literals]: Fixed array holding the materialized literals. |
| // |
| // If the function contains object, regexp or array literals, the |
| // literals array prefix contains the object, regexp, and array |
| // function to be used when creating these literals. This is |
| // necessary so that we do not dynamically lookup the object, regexp |
| // or array functions. Performing a dynamic lookup, we might end up |
| // using the functions from a new context that we should not have |
| // access to. |
| DECL_ACCESSORS(literals, FixedArray) |
| |
| // The initial map for an object created by this constructor. |
| inline Map* initial_map(); |
| inline void set_initial_map(Map* value); |
| inline bool has_initial_map(); |
| |
| // Get and set the prototype property on a JSFunction. If the |
| // function has an initial map the prototype is set on the initial |
| // map. Otherwise, the prototype is put in the initial map field |
| // until an initial map is needed. |
| inline bool has_prototype(); |
| inline bool has_instance_prototype(); |
| inline Object* prototype(); |
| inline Object* instance_prototype(); |
| Object* SetInstancePrototype(Object* value); |
| Object* SetPrototype(Object* value); |
| |
| // Accessor for this function's initial map's [[class]] |
| // property. This is primarily used by ECMA native functions. This |
| // method sets the class_name field of this function's initial map |
| // to a given value. It creates an initial map if this function does |
| // not have one. Note that this method does not copy the initial map |
| // if it has one already, but simply replaces it with the new value. |
| // Instances created afterwards will have a map whose [[class]] is |
| // set to 'value', but there is no guarantees on instances created |
| // before. |
| Object* SetInstanceClassName(String* name); |
| |
| // Returns if this function has been compiled to native code yet. |
| inline bool is_compiled(); |
| |
| // Casting. |
| static inline JSFunction* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSFunctionPrint(); |
| void JSFunctionVerify(); |
| #endif |
| |
| // Returns the number of allocated literals. |
| inline int NumberOfLiterals(); |
| |
| // Retrieve the global context from a function's literal array. |
| static Context* GlobalContextFromLiterals(FixedArray* literals); |
| |
| // Layout descriptors. |
| static const int kPrototypeOrInitialMapOffset = JSObject::kHeaderSize; |
| static const int kSharedFunctionInfoOffset = |
| kPrototypeOrInitialMapOffset + kPointerSize; |
| static const int kContextOffset = kSharedFunctionInfoOffset + kPointerSize; |
| static const int kLiteralsOffset = kContextOffset + kPointerSize; |
| static const int kSize = kLiteralsOffset + kPointerSize; |
| |
| // Layout of the literals array. |
| static const int kLiteralsPrefixSize = 1; |
| static const int kLiteralGlobalContextIndex = 0; |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSFunction); |
| }; |
| |
| |
| // JSGlobalProxy's prototype must be a JSGlobalObject or null, |
| // and the prototype is hidden. JSGlobalProxy always delegates |
| // property accesses to its prototype if the prototype is not null. |
| // |
| // A JSGlobalProxy can be reinitialized which will preserve its identity. |
| // |
| // Accessing a JSGlobalProxy requires security check. |
| |
| class JSGlobalProxy : public JSObject { |
| public: |
| // [context]: the owner global context of this proxy object. |
| // It is null value if this object is not used by any context. |
| DECL_ACCESSORS(context, Object) |
| |
| // Casting. |
| static inline JSGlobalProxy* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSGlobalProxyPrint(); |
| void JSGlobalProxyVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kContextOffset = JSObject::kHeaderSize; |
| static const int kSize = kContextOffset + kPointerSize; |
| |
| private: |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalProxy); |
| }; |
| |
| |
| // Forward declaration. |
| class JSBuiltinsObject; |
| |
| // Common super class for JavaScript global objects and the special |
| // builtins global objects. |
| class GlobalObject: public JSObject { |
| public: |
| // [builtins]: the object holding the runtime routines written in JS. |
| DECL_ACCESSORS(builtins, JSBuiltinsObject) |
| |
| // [global context]: the global context corresponding to this global object. |
| DECL_ACCESSORS(global_context, Context) |
| |
| // [global receiver]: the global receiver object of the context |
| DECL_ACCESSORS(global_receiver, JSObject) |
| |
| // Casting. |
| static inline GlobalObject* cast(Object* obj); |
| |
| // Layout description. |
| static const int kBuiltinsOffset = JSObject::kHeaderSize; |
| static const int kGlobalContextOffset = kBuiltinsOffset + kPointerSize; |
| static const int kGlobalReceiverOffset = kGlobalContextOffset + kPointerSize; |
| static const int kHeaderSize = kGlobalReceiverOffset + kPointerSize; |
| |
| private: |
| friend class AGCCVersionRequiresThisClassToHaveAFriendSoHereItIs; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(GlobalObject); |
| }; |
| |
| |
| // JavaScript global object. |
| class JSGlobalObject: public GlobalObject { |
| public: |
| // Casting. |
| static inline JSGlobalObject* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSGlobalObjectPrint(); |
| void JSGlobalObjectVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kSize = GlobalObject::kHeaderSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalObject); |
| }; |
| |
| |
| // Builtins global object which holds the runtime routines written in |
| // JavaScript. |
| class JSBuiltinsObject: public GlobalObject { |
| public: |
| // Accessors for the runtime routines written in JavaScript. |
| inline Object* javascript_builtin(Builtins::JavaScript id); |
| inline void set_javascript_builtin(Builtins::JavaScript id, Object* value); |
| |
| // Casting. |
| static inline JSBuiltinsObject* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSBuiltinsObjectPrint(); |
| void JSBuiltinsObjectVerify(); |
| #endif |
| |
| // Layout description. The size of the builtins object includes |
| // room for one pointer per runtime routine written in javascript. |
| static const int kJSBuiltinsCount = Builtins::id_count; |
| static const int kJSBuiltinsOffset = GlobalObject::kHeaderSize; |
| static const int kSize = |
| kJSBuiltinsOffset + (kJSBuiltinsCount * kPointerSize); |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSBuiltinsObject); |
| }; |
| |
| |
| // Representation for JS Wrapper objects, String, Number, Boolean, Date, etc. |
| class JSValue: public JSObject { |
| public: |
| // [value]: the object being wrapped. |
| DECL_ACCESSORS(value, Object) |
| |
| // Casting. |
| static inline JSValue* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSValuePrint(); |
| void JSValueVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSValue); |
| }; |
| |
| // Regular expressions |
| // The regular expression holds a single reference to a FixedArray in |
| // the kDataOffset field. |
| // The FixedArray contains the following data: |
| // - tag : type of regexp implementation (not compiled yet, atom or irregexp) |
| // - reference to the original source string |
| // - reference to the original flag string |
| // If it is an atom regexp |
| // - a reference to a literal string to search for |
| // If it is an irregexp regexp: |
| // - a reference to code for ASCII inputs (bytecode or compiled). |
| // - a reference to code for UC16 inputs (bytecode or compiled). |
| // - max number of registers used by irregexp implementations. |
| // - number of capture registers (output values) of the regexp. |
| class JSRegExp: public JSObject { |
| public: |
| // Meaning of Type: |
| // NOT_COMPILED: Initial value. No data has been stored in the JSRegExp yet. |
| // ATOM: A simple string to match against using an indexOf operation. |
| // IRREGEXP: Compiled with Irregexp. |
| // IRREGEXP_NATIVE: Compiled to native code with Irregexp. |
| enum Type { NOT_COMPILED, ATOM, IRREGEXP }; |
| enum Flag { NONE = 0, GLOBAL = 1, IGNORE_CASE = 2, MULTILINE = 4 }; |
| |
| class Flags { |
| public: |
| explicit Flags(uint32_t value) : value_(value) { } |
| bool is_global() { return (value_ & GLOBAL) != 0; } |
| bool is_ignore_case() { return (value_ & IGNORE_CASE) != 0; } |
| bool is_multiline() { return (value_ & MULTILINE) != 0; } |
| uint32_t value() { return value_; } |
| private: |
| uint32_t value_; |
| }; |
| |
| DECL_ACCESSORS(data, Object) |
| |
| inline Type TypeTag(); |
| inline int CaptureCount(); |
| inline Flags GetFlags(); |
| inline String* Pattern(); |
| inline Object* DataAt(int index); |
| // Set implementation data after the object has been prepared. |
| inline void SetDataAt(int index, Object* value); |
| |
| static inline JSRegExp* cast(Object* obj); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSRegExpVerify(); |
| #endif |
| |
| static const int kDataOffset = JSObject::kHeaderSize; |
| static const int kSize = kDataOffset + kIntSize; |
| |
| // Indices in the data array. |
| static const int kTagIndex = 0; |
| static const int kSourceIndex = kTagIndex + 1; |
| static const int kFlagsIndex = kSourceIndex + 1; |
| static const int kDataIndex = kFlagsIndex + 1; |
| // The data fields are used in different ways depending on the |
| // value of the tag. |
| // Atom regexps (literal strings). |
| static const int kAtomPatternIndex = kDataIndex; |
| |
| static const int kAtomDataSize = kAtomPatternIndex + 1; |
| |
| // Irregexp compiled code or bytecode for ASCII. |
| static const int kIrregexpASCIICodeIndex = kDataIndex; |
| // Irregexp compiled code or bytecode for UC16. |
| static const int kIrregexpUC16CodeIndex = kDataIndex + 1; |
| // Maximal number of registers used by either ASCII or UC16. |
| // Only used to check that there is enough stack space |
| static const int kIrregexpMaxRegisterCountIndex = kDataIndex + 2; |
| // Number of captures in the compiled regexp. |
| static const int kIrregexpCaptureCountIndex = kDataIndex + 3; |
| |
| static const int kIrregexpDataSize = kIrregexpCaptureCountIndex + 1; |
| }; |
| |
| |
| class CompilationCacheTable: public HashTable<0, 2> { |
| public: |
| // Find cached value for a string key, otherwise return null. |
| Object* Lookup(String* src); |
| Object* LookupEval(String* src, Context* context); |
| Object* LookupRegExp(String* source, JSRegExp::Flags flags); |
| Object* Put(String* src, Object* value); |
| Object* PutEval(String* src, Context* context, Object* value); |
| Object* PutRegExp(String* src, JSRegExp::Flags flags, FixedArray* value); |
| |
| static inline CompilationCacheTable* cast(Object* obj); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheTable); |
| }; |
| |
| |
| enum AllowNullsFlag {ALLOW_NULLS, DISALLOW_NULLS}; |
| enum RobustnessFlag {ROBUST_STRING_TRAVERSAL, FAST_STRING_TRAVERSAL}; |
| |
| |
| class StringHasher { |
| public: |
| inline StringHasher(int length); |
| |
| // Returns true if the hash of this string can be computed without |
| // looking at the contents. |
| inline bool has_trivial_hash(); |
| |
| // Add a character to the hash and update the array index calculation. |
| inline void AddCharacter(uc32 c); |
| |
| // Adds a character to the hash but does not update the array index |
| // calculation. This can only be called when it has been verified |
| // that the input is not an array index. |
| inline void AddCharacterNoIndex(uc32 c); |
| |
| // Returns the value to store in the hash field of a string with |
| // the given length and contents. |
| uint32_t GetHashField(); |
| |
| // Returns true if the characters seen so far make up a legal array |
| // index. |
| bool is_array_index() { return is_array_index_; } |
| |
| bool is_valid() { return is_valid_; } |
| |
| void invalidate() { is_valid_ = false; } |
| |
| private: |
| |
| uint32_t array_index() { |
| ASSERT(is_array_index()); |
| return array_index_; |
| } |
| |
| inline uint32_t GetHash(); |
| |
| int length_; |
| uint32_t raw_running_hash_; |
| uint32_t array_index_; |
| bool is_array_index_; |
| bool is_first_char_; |
| bool is_valid_; |
| }; |
| |
| |
| // The characteristics of a string are stored in its map. Retrieving these |
| // few bits of information is moderately expensive, involving two memory |
| // loads where the second is dependent on the first. To improve efficiency |
| // the shape of the string is given its own class so that it can be retrieved |
| // once and used for several string operations. A StringShape is small enough |
| // to be passed by value and is immutable, but be aware that flattening a |
| // string can potentially alter its shape. Also be aware that a GC caused by |
| // something else can alter the shape of a string due to ConsString |
| // shortcutting. Keeping these restrictions in mind has proven to be error- |
| // prone and so we no longer put StringShapes in variables unless there is a |
| // concrete performance benefit at that particular point in the code. |
| class StringShape BASE_EMBEDDED { |
| public: |
| inline explicit StringShape(String* s); |
| inline explicit StringShape(Map* s); |
| inline explicit StringShape(InstanceType t); |
| inline bool IsSequential(); |
| inline bool IsExternal(); |
| inline bool IsCons(); |
| inline bool IsSliced(); |
| inline bool IsExternalAscii(); |
| inline bool IsExternalTwoByte(); |
| inline bool IsSequentialAscii(); |
| inline bool IsSequentialTwoByte(); |
| inline bool IsSymbol(); |
| inline StringRepresentationTag representation_tag(); |
| inline uint32_t full_representation_tag(); |
| inline uint32_t size_tag(); |
| #ifdef DEBUG |
| inline uint32_t type() { return type_; } |
| inline void invalidate() { valid_ = false; } |
| inline bool valid() { return valid_; } |
| #else |
| inline void invalidate() { } |
| #endif |
| private: |
| uint32_t type_; |
| #ifdef DEBUG |
| inline void set_valid() { valid_ = true; } |
| bool valid_; |
| #else |
| inline void set_valid() { } |
| #endif |
| }; |
| |
| |
| // The String abstract class captures JavaScript string values: |
| // |
| // Ecma-262: |
| // 4.3.16 String Value |
| // A string value is a member of the type String and is a finite |
| // ordered sequence of zero or more 16-bit unsigned integer values. |
| // |
| // All string values have a length field. |
| class String: public HeapObject { |
| public: |
| // Get and set the length of the string. |
| inline int length(); |
| inline void set_length(int value); |
| |
| // Get and set the uninterpreted length field of the string. Notice |
| // that the length field is also used to cache the hash value of |
| // strings. In order to get or set the actual length of the string |
| // use the length() and set_length methods. |
| inline uint32_t length_field(); |
| inline void set_length_field(uint32_t value); |
| |
| inline bool IsAsciiRepresentation(); |
| inline bool IsTwoByteRepresentation(); |
| |
| // Get and set individual two byte chars in the string. |
| inline void Set(int index, uint16_t value); |
| // Get individual two byte char in the string. Repeated calls |
| // to this method are not efficient unless the string is flat. |
| inline uint16_t Get(int index); |
| |
| // Try to flatten the top level ConsString that is hiding behind this |
| // string. This is a no-op unless the string is a ConsString or a |
| // SlicedString. Flatten mutates the ConsString and might return a |
| // failure. |
| Object* TryFlatten(); |
| |
| // Try to flatten the string. Checks first inline to see if it is necessary. |
| // Do not handle allocation failures. After calling TryFlattenIfNotFlat, the |
| // string could still be a ConsString, in which case a failure is returned. |
| // Use FlattenString from Handles.cc to be sure to flatten. |
| inline Object* TryFlattenIfNotFlat(); |
| |
| Vector<const char> ToAsciiVector(); |
| Vector<const uc16> ToUC16Vector(); |
| |
| // Mark the string as an undetectable object. It only applies to |
| // ascii and two byte string types. |
| bool MarkAsUndetectable(); |
| |
| // Slice the string and return a substring. |
| Object* Slice(int from, int to); |
| |
| // String equality operations. |
| inline bool Equals(String* other); |
| bool IsEqualTo(Vector<const char> str); |
| |
| // Return a UTF8 representation of the string. The string is null |
| // terminated but may optionally contain nulls. Length is returned |
| // in length_output if length_output is not a null pointer The string |
| // should be nearly flat, otherwise the performance of this method may |
| // be very slow (quadratic in the length). Setting robustness_flag to |
| // ROBUST_STRING_TRAVERSAL invokes behaviour that is robust This means it |
| // handles unexpected data without causing assert failures and it does not |
| // do any heap allocations. This is useful when printing stack traces. |
| SmartPointer<char> ToCString(AllowNullsFlag allow_nulls, |
| RobustnessFlag robustness_flag, |
| int offset, |
| int length, |
| int* length_output = 0); |
| SmartPointer<char> ToCString( |
| AllowNullsFlag allow_nulls = DISALLOW_NULLS, |
| RobustnessFlag robustness_flag = FAST_STRING_TRAVERSAL, |
| int* length_output = 0); |
| |
| int Utf8Length(); |
| |
| // Return a 16 bit Unicode representation of the string. |
| // The string should be nearly flat, otherwise the performance of |
| // of this method may be very bad. Setting robustness_flag to |
| // ROBUST_STRING_TRAVERSAL invokes behaviour that is robust This means it |
| // handles unexpected data without causing assert failures and it does not |
| // do any heap allocations. This is useful when printing stack traces. |
| SmartPointer<uc16> ToWideCString( |
| RobustnessFlag robustness_flag = FAST_STRING_TRAVERSAL); |
| |
| // Tells whether the hash code has been computed. |
| inline bool HasHashCode(); |
| |
| // Returns a hash value used for the property table |
| inline uint32_t Hash(); |
| |
| static uint32_t ComputeLengthAndHashField(unibrow::CharacterStream* buffer, |
| int length); |
| |
| static bool ComputeArrayIndex(unibrow::CharacterStream* buffer, |
| uint32_t* index, |
| int length); |
| |
| // Externalization. |
| bool MakeExternal(v8::String::ExternalStringResource* resource); |
| bool MakeExternal(v8::String::ExternalAsciiStringResource* resource); |
| |
| // Conversion. |
| inline bool AsArrayIndex(uint32_t* index); |
| |
| // Casting. |
| static inline String* cast(Object* obj); |
| |
| void PrintOn(FILE* out); |
| |
| // For use during stack traces. Performs rudimentary sanity check. |
| bool LooksValid(); |
| |
| // Dispatched behavior. |
| void StringShortPrint(StringStream* accumulator); |
| #ifdef DEBUG |
| void StringPrint(); |
| void StringVerify(); |
| #endif |
| inline bool IsFlat(); |
| |
| // Layout description. |
| static const int kLengthOffset = HeapObject::kHeaderSize; |
| static const int kSize = kLengthOffset + kIntSize; |
| |
| // Limits on sizes of different types of strings. |
| static const int kMaxShortStringSize = 63; |
| static const int kMaxMediumStringSize = 16383; |
| |
| static const int kMaxArrayIndexSize = 10; |
| |
| // Max ascii char code. |
| static const int kMaxAsciiCharCode = unibrow::Utf8::kMaxOneByteChar; |
| static const unsigned kMaxAsciiCharCodeU = unibrow::Utf8::kMaxOneByteChar; |
| static const int kMaxUC16CharCode = 0xffff; |
| |
| // Minimum length for a cons or sliced string. |
| static const int kMinNonFlatLength = 13; |
| |
| // Mask constant for checking if a string has a computed hash code |
| // and if it is an array index. The least significant bit indicates |
| // whether a hash code has been computed. If the hash code has been |
| // computed the 2nd bit tells whether the string can be used as an |
| // array index. |
| static const int kHashComputedMask = 1; |
| static const int kIsArrayIndexMask = 1 << 1; |
| static const int kNofLengthBitFields = 2; |
| |
| // Array index strings this short can keep their index in the hash |
| // field. |
| static const int kMaxCachedArrayIndexLength = 7; |
| |
| // Shift constants for retriving length and hash code from |
| // length/hash field. |
| static const int kHashShift = kNofLengthBitFields; |
| static const int kShortLengthShift = kHashShift + kShortStringTag; |
| static const int kMediumLengthShift = kHashShift + kMediumStringTag; |
| static const int kLongLengthShift = kHashShift + kLongStringTag; |
| |
| // Limit for truncation in short printing. |
| static const int kMaxShortPrintLength = 1024; |
| |
| // Support for regular expressions. |
| const uc16* GetTwoByteData(); |
| const uc16* GetTwoByteData(unsigned start); |
| |
| // Support for StringInputBuffer |
| static const unibrow::byte* ReadBlock(String* input, |
| unibrow::byte* util_buffer, |
| unsigned capacity, |
| unsigned* remaining, |
| unsigned* offset); |
| static const unibrow::byte* ReadBlock(String** input, |
| unibrow::byte* util_buffer, |
| unsigned capacity, |
| unsigned* remaining, |
| unsigned* offset); |
| |
| // Helper function for flattening strings. |
| template <typename sinkchar> |
| static void WriteToFlat(String* source, |
| sinkchar* sink, |
| int from, |
| int to); |
| |
| protected: |
| class ReadBlockBuffer { |
| public: |
| ReadBlockBuffer(unibrow::byte* util_buffer_, |
| unsigned cursor_, |
| unsigned capacity_, |
| unsigned remaining_) : |
| util_buffer(util_buffer_), |
| cursor(cursor_), |
| capacity(capacity_), |
| remaining(remaining_) { |
| } |
| unibrow::byte* util_buffer; |
| unsigned cursor; |
| unsigned capacity; |
| unsigned remaining; |
| }; |
| |
| // NOTE: If you call StringInputBuffer routines on strings that are |
| // too deeply nested trees of cons and slice strings, then this |
| // routine will overflow the stack. Strings that are merely deeply |
| // nested trees of cons strings do not have a problem apart from |
| // performance. |
| |
| static inline const unibrow::byte* ReadBlock(String* input, |
| ReadBlockBuffer* buffer, |
| unsigned* offset, |
| unsigned max_chars); |
| static void ReadBlockIntoBuffer(String* input, |
| ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned max_chars); |
| |
| private: |
| // Slow case of String::Equals. This implementation works on any strings |
| // but it is most efficient on strings that are almost flat. |
| bool SlowEquals(String* other); |
| |
| // Slow case of AsArrayIndex. |
| bool SlowAsArrayIndex(uint32_t* index); |
| |
| // Compute and set the hash code. |
| uint32_t ComputeAndSetHash(); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(String); |
| }; |
| |
| |
| // The SeqString abstract class captures sequential string values. |
| class SeqString: public String { |
| public: |
| |
| // Casting. |
| static inline SeqString* cast(Object* obj); |
| |
| // Dispatched behaviour. |
| // For regexp code. |
| uint16_t* SeqStringGetTwoByteAddress(); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqString); |
| }; |
| |
| |
| // The AsciiString class captures sequential ascii string objects. |
| // Each character in the AsciiString is an ascii character. |
| class SeqAsciiString: public SeqString { |
| public: |
| // Dispatched behavior. |
| inline uint16_t SeqAsciiStringGet(int index); |
| inline void SeqAsciiStringSet(int index, uint16_t value); |
| |
| // Get the address of the characters in this string. |
| inline Address GetCharsAddress(); |
| |
| inline char* GetChars(); |
| |
| // Casting |
| static inline SeqAsciiString* cast(Object* obj); |
| |
| // Garbage collection support. This method is called by the |
| // garbage collector to compute the actual size of an AsciiString |
| // instance. |
| inline int SeqAsciiStringSize(InstanceType instance_type); |
| |
| // Computes the size for an AsciiString instance of a given length. |
| static int SizeFor(int length) { |
| return kHeaderSize + OBJECT_SIZE_ALIGN(length * kCharSize); |
| } |
| |
| // Layout description. |
| static const int kHeaderSize = String::kSize; |
| |
| // Support for StringInputBuffer. |
| inline void SeqAsciiStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset, |
| unsigned chars); |
| inline const unibrow::byte* SeqAsciiStringReadBlock(unsigned* remaining, |
| unsigned* offset, |
| unsigned chars); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqAsciiString); |
| }; |
| |
| |
| // The TwoByteString class captures sequential unicode string objects. |
| // Each character in the TwoByteString is a two-byte uint16_t. |
| class SeqTwoByteString: public SeqString { |
| public: |
| // Dispatched behavior. |
| inline uint16_t SeqTwoByteStringGet(int index); |
| inline void SeqTwoByteStringSet(int index, uint16_t value); |
| |
| // Get the address of the characters in this string. |
| inline Address GetCharsAddress(); |
| |
| inline uc16* GetChars(); |
| |
| // For regexp code. |
| const uint16_t* SeqTwoByteStringGetData(unsigned start); |
| |
| // Casting |
| static inline SeqTwoByteString* cast(Object* obj); |
| |
| // Garbage collection support. This method is called by the |
| // garbage collector to compute the actual size of a TwoByteString |
| // instance. |
| inline int SeqTwoByteStringSize(InstanceType instance_type); |
| |
| // Computes the size for a TwoByteString instance of a given length. |
| static int SizeFor(int length) { |
| return kHeaderSize + OBJECT_SIZE_ALIGN(length * kShortSize); |
| } |
| |
| // Layout description. |
| static const int kHeaderSize = String::kSize; |
| |
| // Support for StringInputBuffer. |
| inline void SeqTwoByteStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqTwoByteString); |
| }; |
| |
| |
| // The ConsString class describes string values built by using the |
| // addition operator on strings. A ConsString is a pair where the |
| // first and second components are pointers to other string values. |
| // One or both components of a ConsString can be pointers to other |
| // ConsStrings, creating a binary tree of ConsStrings where the leaves |
| // are non-ConsString string values. The string value represented by |
| // a ConsString can be obtained by concatenating the leaf string |
| // values in a left-to-right depth-first traversal of the tree. |
| class ConsString: public String { |
| public: |
| // First string of the cons cell. |
| inline String* first(); |
| // Doesn't check that the result is a string, even in debug mode. This is |
| // useful during GC where the mark bits confuse the checks. |
| inline Object* unchecked_first(); |
| inline void set_first(String* first, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Second string of the cons cell. |
| inline String* second(); |
| // Doesn't check that the result is a string, even in debug mode. This is |
| // useful during GC where the mark bits confuse the checks. |
| inline Object* unchecked_second(); |
| inline void set_second(String* second, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Dispatched behavior. |
| uint16_t ConsStringGet(int index); |
| |
| // Casting. |
| static inline ConsString* cast(Object* obj); |
| |
| // Garbage collection support. This method is called during garbage |
| // collection to iterate through the heap pointers in the body of |
| // the ConsString. |
| void ConsStringIterateBody(ObjectVisitor* v); |
| |
| // Layout description. |
| static const int kFirstOffset = String::kSize; |
| static const int kSecondOffset = kFirstOffset + kPointerSize; |
| static const int kSize = kSecondOffset + kPointerSize; |
| |
| // Support for StringInputBuffer. |
| inline const unibrow::byte* ConsStringReadBlock(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| inline void ConsStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| |
| // Minimum length for a cons string. |
| static const int kMinLength = 13; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); |
| }; |
| |
| |
| // The SlicedString class describes string values that are slices of |
| // some other string. SlicedStrings consist of a reference to an |
| // underlying heap-allocated string value, a start index, and the |
| // length field common to all strings. |
| class SlicedString: public String { |
| public: |
| // The underlying string buffer. |
| inline String* buffer(); |
| inline void set_buffer(String* buffer); |
| |
| // The start index of the slice. |
| inline int start(); |
| inline void set_start(int start); |
| |
| // Dispatched behavior. |
| uint16_t SlicedStringGet(int index); |
| |
| // Casting. |
| static inline SlicedString* cast(Object* obj); |
| |
| // Garbage collection support. |
| void SlicedStringIterateBody(ObjectVisitor* v); |
| |
| // Layout description |
| static const int kBufferOffset = String::kSize; |
| static const int kStartOffset = kBufferOffset + kPointerSize; |
| static const int kSize = kStartOffset + kIntSize; |
| |
| // Support for StringInputBuffer. |
| inline const unibrow::byte* SlicedStringReadBlock(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| inline void SlicedStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SlicedString); |
| }; |
| |
| |
| // The ExternalString class describes string values that are backed by |
| // a string resource that lies outside the V8 heap. ExternalStrings |
| // consist of the length field common to all strings, a pointer to the |
| // external resource. It is important to ensure (externally) that the |
| // resource is not deallocated while the ExternalString is live in the |
| // V8 heap. |
| // |
| // The API expects that all ExternalStrings are created through the |
| // API. Therefore, ExternalStrings should not be used internally. |
| class ExternalString: public String { |
| public: |
| // Casting |
| static inline ExternalString* cast(Object* obj); |
| |
| // Layout description. |
| static const int kResourceOffset = String::kSize; |
| static const int kSize = kResourceOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalString); |
| }; |
| |
| |
| // The ExternalAsciiString class is an external string backed by an |
| // ASCII string. |
| class ExternalAsciiString: public ExternalString { |
| public: |
| typedef v8::String::ExternalAsciiStringResource Resource; |
| |
| // The underlying resource. |
| inline Resource* resource(); |
| inline void set_resource(Resource* buffer); |
| |
| // Dispatched behavior. |
| uint16_t ExternalAsciiStringGet(int index); |
| |
| // Casting. |
| static inline ExternalAsciiString* cast(Object* obj); |
| |
| // Support for StringInputBuffer. |
| const unibrow::byte* ExternalAsciiStringReadBlock(unsigned* remaining, |
| unsigned* offset, |
| unsigned chars); |
| inline void ExternalAsciiStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset, |
| unsigned chars); |
| |
| // Identify the map for the external string/symbol with a particular length. |
| static inline Map* StringMap(int length); |
| static inline Map* SymbolMap(int length); |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalAsciiString); |
| }; |
| |
| |
| // The ExternalTwoByteString class is an external string backed by a UTF-16 |
| // encoded string. |
| class ExternalTwoByteString: public ExternalString { |
| public: |
| typedef v8::String::ExternalStringResource Resource; |
| |
| // The underlying string resource. |
| inline Resource* resource(); |
| inline void set_resource(Resource* buffer); |
| |
| // Dispatched behavior. |
| uint16_t ExternalTwoByteStringGet(int index); |
| |
| // For regexp code. |
| const uint16_t* ExternalTwoByteStringGetData(unsigned start); |
| |
| // Casting. |
| static inline ExternalTwoByteString* cast(Object* obj); |
| |
| // Support for StringInputBuffer. |
| void ExternalTwoByteStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
| unsigned* offset_ptr, |
| unsigned chars); |
| |
| // Identify the map for the external string/symbol with a particular length. |
| static inline Map* StringMap(int length); |
| static inline Map* SymbolMap(int length); |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalTwoByteString); |
| }; |
| |
| |
| // A flat string reader provides random access to the contents of a |
| // string independent of the character width of the string. The handle |
| // must be valid as long as the reader is being used. |
| class FlatStringReader BASE_EMBEDDED { |
| public: |
| explicit FlatStringReader(Handle<String> str); |
| explicit FlatStringReader(Vector<const char> input); |
| ~FlatStringReader(); |
| void RefreshState(); |
| inline uc32 Get(int index); |
| int length() { return length_; } |
| static void PostGarbageCollectionProcessing(); |
| private: |
| String** str_; |
| bool is_ascii_; |
| int length_; |
| const void* start_; |
| FlatStringReader* prev_; |
| static FlatStringReader* top_; |
| }; |
| |
| |
| // Note that StringInputBuffers are not valid across a GC! To fix this |
| // it would have to store a String Handle instead of a String* and |
| // AsciiStringReadBlock would have to be modified to use memcpy. |
| // |
| // StringInputBuffer is able to traverse any string regardless of how |
| // deeply nested a sequence of ConsStrings it is made of. However, |
| // performance will be better if deep strings are flattened before they |
| // are traversed. Since flattening requires memory allocation this is |
| // not always desirable, however (esp. in debugging situations). |
| class StringInputBuffer: public unibrow::InputBuffer<String, String*, 1024> { |
| public: |
| virtual void Seek(unsigned pos); |
| inline StringInputBuffer(): unibrow::InputBuffer<String, String*, 1024>() {} |
| inline StringInputBuffer(String* backing): |
| unibrow::InputBuffer<String, String*, 1024>(backing) {} |
| }; |
| |
| |
| class SafeStringInputBuffer |
| : public unibrow::InputBuffer<String, String**, 256> { |
| public: |
| virtual void Seek(unsigned pos); |
| inline SafeStringInputBuffer() |
| : unibrow::InputBuffer<String, String**, 256>() {} |
| inline SafeStringInputBuffer(String** backing) |
| : unibrow::InputBuffer<String, String**, 256>(backing) {} |
| }; |
| |
| |
| template <typename T> |
| class VectorIterator { |
| public: |
| VectorIterator(T* d, int l) : data_(Vector<const T>(d, l)), index_(0) { } |
| explicit VectorIterator(Vector<const T> data) : data_(data), index_(0) { } |
| T GetNext() { return data_[index_++]; } |
| bool has_more() { return index_ < data_.length(); } |
| private: |
| Vector<const T> data_; |
| int index_; |
| }; |
| |
| |
| // The Oddball describes objects null, undefined, true, and false. |
| class Oddball: public HeapObject { |
| public: |
| // [to_string]: Cached to_string computed at startup. |
| DECL_ACCESSORS(to_string, String) |
| |
| // [to_number]: Cached to_number computed at startup. |
| DECL_ACCESSORS(to_number, Object) |
| |
| // Casting. |
| static inline Oddball* cast(Object* obj); |
| |
| // Dispatched behavior. |
| void OddballIterateBody(ObjectVisitor* v); |
| #ifdef DEBUG |
| void OddballVerify(); |
| #endif |
| |
| // Initialize the fields. |
| Object* Initialize(const char* to_string, Object* to_number); |
| |
| // Layout description. |
| static const int kToStringOffset = HeapObject::kHeaderSize; |
| static const int kToNumberOffset = kToStringOffset + kPointerSize; |
| static const int kSize = kToNumberOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Oddball); |
| }; |
| |
| |
| // Proxy describes objects pointing from JavaScript to C structures. |
| // Since they cannot contain references to JS HeapObjects they can be |
| // placed in old_data_space. |
| class Proxy: public HeapObject { |
| public: |
| // [proxy]: field containing the address. |
| inline Address proxy(); |
| inline void set_proxy(Address value); |
| |
| // Casting. |
| static inline Proxy* cast(Object* obj); |
| |
| // Dispatched behavior. |
| inline void ProxyIterateBody(ObjectVisitor* v); |
| #ifdef DEBUG |
| void ProxyPrint(); |
| void ProxyVerify(); |
| #endif |
| |
| // Layout description. |
| |
| static const int kProxyOffset = HeapObject::kHeaderSize; |
| static const int kSize = kProxyOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Proxy); |
| }; |
| |
| |
| // The JSArray describes JavaScript Arrays |
| // Such an array can be in one of two modes: |
| // - fast, backing storage is a FixedArray and length <= elements.length(); |
| // Please note: push and pop can be used to grow and shrink the array. |
| // - slow, backing storage is a HashTable with numbers as keys. |
| class JSArray: public JSObject { |
| public: |
| // [length]: The length property. |
| DECL_ACCESSORS(length, Object) |
| |
| Object* JSArrayUpdateLengthFromIndex(uint32_t index, Object* value); |
| |
| // Initialize the array with the given capacity. The function may |
| // fail due to out-of-memory situations, but only if the requested |
| // capacity is non-zero. |
| Object* Initialize(int capacity); |
| |
| // Set the content of the array to the content of storage. |
| inline void SetContent(FixedArray* storage); |
| |
| // Casting. |
| static inline JSArray* cast(Object* obj); |
| |
| // Uses handles. Ensures that the fixed array backing the JSArray has at |
| // least the stated size. |
| void EnsureSize(int minimum_size_of_backing_fixed_array); |
| |
| // Dispatched behavior. |
| #ifdef DEBUG |
| void JSArrayPrint(); |
| void JSArrayVerify(); |
| #endif |
| |
| // Layout description. |
| static const int kLengthOffset = JSObject::kHeaderSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray); |
| }; |
| |
| |
| // An accessor must have a getter, but can have no setter. |
| // |
| // When setting a property, V8 searches accessors in prototypes. |
| // If an accessor was found and it does not have a setter, |
| // the request is ignored. |
| // |
| // To allow shadow an accessor property, the accessor can |
| // have READ_ONLY property attribute so that a new value |
| // is added to the local object to shadow the accessor |
| // in prototypes. |
| class AccessorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_ACCESSORS(name, Object) |
| DECL_ACCESSORS(flag, Smi) |
| |
| inline bool all_can_read(); |
| inline void set_all_can_read(bool value); |
| |
| inline bool all_can_write(); |
| inline void set_all_can_write(bool value); |
| |
| inline bool prohibits_overwriting(); |
| inline void set_prohibits_overwriting(bool value); |
| |
| inline PropertyAttributes property_attributes(); |
| inline void set_property_attributes(PropertyAttributes attributes); |
| |
| static inline AccessorInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void AccessorInfoPrint(); |
| void AccessorInfoVerify(); |
| #endif |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kDataOffset = kSetterOffset + kPointerSize; |
| static const int kNameOffset = kDataOffset + kPointerSize; |
| static const int kFlagOffset = kNameOffset + kPointerSize; |
| static const int kSize = kFlagOffset + kPointerSize; |
| |
| private: |
| // Bit positions in flag. |
| static const int kAllCanReadBit = 0; |
| static const int kAllCanWriteBit = 1; |
| static const int kProhibitsOverwritingBit = 2; |
| class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo); |
| }; |
| |
| |
| class AccessCheckInfo: public Struct { |
| public: |
| DECL_ACCESSORS(named_callback, Object) |
| DECL_ACCESSORS(indexed_callback, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| static inline AccessCheckInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void AccessCheckInfoPrint(); |
| void AccessCheckInfoVerify(); |
| #endif |
| |
| static const int kNamedCallbackOffset = HeapObject::kHeaderSize; |
| static const int kIndexedCallbackOffset = kNamedCallbackOffset + kPointerSize; |
| static const int kDataOffset = kIndexedCallbackOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessCheckInfo); |
| }; |
| |
| |
| class InterceptorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| DECL_ACCESSORS(query, Object) |
| DECL_ACCESSORS(deleter, Object) |
| DECL_ACCESSORS(enumerator, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| static inline InterceptorInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void InterceptorInfoPrint(); |
| void InterceptorInfoVerify(); |
| #endif |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kQueryOffset = kSetterOffset + kPointerSize; |
| static const int kDeleterOffset = kQueryOffset + kPointerSize; |
| static const int kEnumeratorOffset = kDeleterOffset + kPointerSize; |
| static const int kDataOffset = kEnumeratorOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptorInfo); |
| }; |
| |
| |
| class CallHandlerInfo: public Struct { |
| public: |
| DECL_ACCESSORS(callback, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| static inline CallHandlerInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void CallHandlerInfoPrint(); |
| void CallHandlerInfoVerify(); |
| #endif |
| |
| static const int kCallbackOffset = HeapObject::kHeaderSize; |
| static const int kDataOffset = kCallbackOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CallHandlerInfo); |
| }; |
| |
| |
| class TemplateInfo: public Struct { |
| public: |
| DECL_ACCESSORS(tag, Object) |
| DECL_ACCESSORS(property_list, Object) |
| |
| #ifdef DEBUG |
| void TemplateInfoVerify(); |
| #endif |
| |
| static const int kTagOffset = HeapObject::kHeaderSize; |
| static const int kPropertyListOffset = kTagOffset + kPointerSize; |
| static const int kHeaderSize = kPropertyListOffset + kPointerSize; |
| protected: |
| friend class AGCCVersionRequiresThisClassToHaveAFriendSoHereItIs; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TemplateInfo); |
| }; |
| |
| |
| class FunctionTemplateInfo: public TemplateInfo { |
| public: |
| DECL_ACCESSORS(serial_number, Object) |
| DECL_ACCESSORS(call_code, Object) |
| DECL_ACCESSORS(property_accessors, Object) |
| DECL_ACCESSORS(prototype_template, Object) |
| DECL_ACCESSORS(parent_template, Object) |
| DECL_ACCESSORS(named_property_handler, Object) |
| DECL_ACCESSORS(indexed_property_handler, Object) |
| DECL_ACCESSORS(instance_template, Object) |
| DECL_ACCESSORS(class_name, Object) |
| DECL_ACCESSORS(signature, Object) |
| DECL_ACCESSORS(instance_call_handler, Object) |
| DECL_ACCESSORS(access_check_info, Object) |
| DECL_ACCESSORS(flag, Smi) |
| |
| // Following properties use flag bits. |
| DECL_BOOLEAN_ACCESSORS(hidden_prototype) |
| DECL_BOOLEAN_ACCESSORS(undetectable) |
| // If the bit is set, object instances created by this function |
| // requires access check. |
| DECL_BOOLEAN_ACCESSORS(needs_access_check) |
| |
| static inline FunctionTemplateInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void FunctionTemplateInfoPrint(); |
| void FunctionTemplateInfoVerify(); |
| #endif |
| |
| static const int kSerialNumberOffset = TemplateInfo::kHeaderSize; |
| static const int kCallCodeOffset = kSerialNumberOffset + kPointerSize; |
| static const int kPropertyAccessorsOffset = kCallCodeOffset + kPointerSize; |
| static const int kPrototypeTemplateOffset = |
| kPropertyAccessorsOffset + kPointerSize; |
| static const int kParentTemplateOffset = |
| kPrototypeTemplateOffset + kPointerSize; |
| static const int kNamedPropertyHandlerOffset = |
| kParentTemplateOffset + kPointerSize; |
| static const int kIndexedPropertyHandlerOffset = |
| kNamedPropertyHandlerOffset + kPointerSize; |
| static const int kInstanceTemplateOffset = |
| kIndexedPropertyHandlerOffset + kPointerSize; |
| static const int kClassNameOffset = kInstanceTemplateOffset + kPointerSize; |
| static const int kSignatureOffset = kClassNameOffset + kPointerSize; |
| static const int kInstanceCallHandlerOffset = kSignatureOffset + kPointerSize; |
| static const int kAccessCheckInfoOffset = |
| kInstanceCallHandlerOffset + kPointerSize; |
| static const int kFlagOffset = kAccessCheckInfoOffset + kPointerSize; |
| static const int kSize = kFlagOffset + kPointerSize; |
| |
| private: |
| // Bit position in the flag, from least significant bit position. |
| static const int kHiddenPrototypeBit = 0; |
| static const int kUndetectableBit = 1; |
| static const int kNeedsAccessCheckBit = 2; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FunctionTemplateInfo); |
| }; |
| |
| |
| class ObjectTemplateInfo: public TemplateInfo { |
| public: |
| DECL_ACCESSORS(constructor, Object) |
| DECL_ACCESSORS(internal_field_count, Object) |
| |
| static inline ObjectTemplateInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void ObjectTemplateInfoPrint(); |
| void ObjectTemplateInfoVerify(); |
| #endif |
| |
| static const int kConstructorOffset = TemplateInfo::kHeaderSize; |
| static const int kInternalFieldCountOffset = |
| kConstructorOffset + kPointerSize; |
| static const int kSize = kInternalFieldCountOffset + kHeaderSize; |
| }; |
| |
| |
| class SignatureInfo: public Struct { |
| public: |
| DECL_ACCESSORS(receiver, Object) |
| DECL_ACCESSORS(args, Object) |
| |
| static inline SignatureInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void SignatureInfoPrint(); |
| void SignatureInfoVerify(); |
| #endif |
| |
| static const int kReceiverOffset = Struct::kHeaderSize; |
| static const int kArgsOffset = kReceiverOffset + kPointerSize; |
| static const int kSize = kArgsOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SignatureInfo); |
| }; |
| |
| |
| class TypeSwitchInfo: public Struct { |
| public: |
| DECL_ACCESSORS(types, Object) |
| |
| static inline TypeSwitchInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void TypeSwitchInfoPrint(); |
| void TypeSwitchInfoVerify(); |
| #endif |
| |
| static const int kTypesOffset = Struct::kHeaderSize; |
| static const int kSize = kTypesOffset + kPointerSize; |
| }; |
| |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| // The DebugInfo class holds additional information for a function being |
| // debugged. |
| class DebugInfo: public Struct { |
| public: |
| // The shared function info for the source being debugged. |
| DECL_ACCESSORS(shared, SharedFunctionInfo) |
| // Code object for the original code. |
| DECL_ACCESSORS(original_code, Code) |
| // Code object for the patched code. This code object is the code object |
| // currently active for the function. |
| DECL_ACCESSORS(code, Code) |
| // Fixed array holding status information for each active break point. |
| DECL_ACCESSORS(break_points, FixedArray) |
| |
| // Check if there is a break point at a code position. |
| bool HasBreakPoint(int code_position); |
| // Get the break point info object for a code position. |
| Object* GetBreakPointInfo(int code_position); |
| // Clear a break point. |
| static void ClearBreakPoint(Handle<DebugInfo> debug_info, |
| int code_position, |
| Handle<Object> break_point_object); |
| // Set a break point. |
| static void SetBreakPoint(Handle<DebugInfo> debug_info, int code_position, |
| int source_position, int statement_position, |
| Handle<Object> break_point_object); |
| // Get the break point objects for a code position. |
| Object* GetBreakPointObjects(int code_position); |
| // Find the break point info holding this break point object. |
| static Object* FindBreakPointInfo(Handle<DebugInfo> debug_info, |
| Handle<Object> break_point_object); |
| // Get the number of break points for this function. |
| int GetBreakPointCount(); |
| |
| static inline DebugInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void DebugInfoPrint(); |
| void DebugInfoVerify(); |
| #endif |
| |
| static const int kSharedFunctionInfoIndex = Struct::kHeaderSize; |
| static const int kOriginalCodeIndex = kSharedFunctionInfoIndex + kPointerSize; |
| static const int kPatchedCodeIndex = kOriginalCodeIndex + kPointerSize; |
| static const int kActiveBreakPointsCountIndex = |
| kPatchedCodeIndex + kPointerSize; |
| static const int kBreakPointsStateIndex = |
| kActiveBreakPointsCountIndex + kPointerSize; |
| static const int kSize = kBreakPointsStateIndex + kPointerSize; |
| |
| private: |
| static const int kNoBreakPointInfo = -1; |
| |
| // Lookup the index in the break_points array for a code position. |
| int GetBreakPointInfoIndex(int code_position); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(DebugInfo); |
| }; |
| |
| |
| // The BreakPointInfo class holds information for break points set in a |
| // function. The DebugInfo object holds a BreakPointInfo object for each code |
| // position with one or more break points. |
| class BreakPointInfo: public Struct { |
| public: |
| // The position in the code for the break point. |
| DECL_ACCESSORS(code_position, Smi) |
| // The position in the source for the break position. |
| DECL_ACCESSORS(source_position, Smi) |
| // The position in the source for the last statement before this break |
| // position. |
| DECL_ACCESSORS(statement_position, Smi) |
| // List of related JavaScript break points. |
| DECL_ACCESSORS(break_point_objects, Object) |
| |
| // Removes a break point. |
| static void ClearBreakPoint(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Set a break point. |
| static void SetBreakPoint(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Check if break point info has this break point object. |
| static bool HasBreakPointObject(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Get the number of break points for this code position. |
| int GetBreakPointCount(); |
| |
| static inline BreakPointInfo* cast(Object* obj); |
| |
| #ifdef DEBUG |
| void BreakPointInfoPrint(); |
| void BreakPointInfoVerify(); |
| #endif |
| |
| static const int kCodePositionIndex = Struct::kHeaderSize; |
| static const int kSourcePositionIndex = kCodePositionIndex + kPointerSize; |
| static const int kStatementPositionIndex = |
| kSourcePositionIndex + kPointerSize; |
| static const int kBreakPointObjectsIndex = |
| kStatementPositionIndex + kPointerSize; |
| static const int kSize = kBreakPointObjectsIndex + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BreakPointInfo); |
| }; |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| |
| |
| #undef DECL_BOOLEAN_ACCESSORS |
| #undef DECL_ACCESSORS |
| |
| |
| // Abstract base class for visiting, and optionally modifying, the |
| // pointers contained in Objects. Used in GC and serialization/deserialization. |
| class ObjectVisitor BASE_EMBEDDED { |
| public: |
| virtual ~ObjectVisitor() {} |
| |
| // Visits a contiguous arrays of pointers in the half-open range |
| // [start, end). Any or all of the values may be modified on return. |
| virtual void VisitPointers(Object** start, Object** end) = 0; |
| |
| // To allow lazy clearing of inline caches the visitor has |
| // a rich interface for iterating over Code objects.. |
| |
| // Called prior to visiting the body of a Code object. |
| virtual void BeginCodeIteration(Code* code); |
| |
| // Visits a code target in the instruction stream. |
| virtual void VisitCodeTarget(RelocInfo* rinfo); |
| |
| // Visits a runtime entry in the instruction stream. |
| virtual void VisitRuntimeEntry(RelocInfo* rinfo) {} |
| |
| // Visits a debug call target in the instruction stream. |
| virtual void VisitDebugTarget(RelocInfo* rinfo); |
| |
| // Called after completing visiting the body of a Code object. |
| virtual void EndCodeIteration(Code* code) {} |
| |
| // Handy shorthand for visiting a single pointer. |
| virtual void VisitPointer(Object** p) { VisitPointers(p, p + 1); } |
| |
| // Visits a contiguous arrays of external references (references to the C++ |
| // heap) in the half-open range [start, end). Any or all of the values |
| // may be modified on return. |
| virtual void VisitExternalReferences(Address* start, Address* end) {} |
| |
| inline void VisitExternalReference(Address* p) { |
| VisitExternalReferences(p, p + 1); |
| } |
| |
| #ifdef DEBUG |
| // Intended for serialization/deserialization checking: insert, or |
| // check for the presence of, a tag at this position in the stream. |
| virtual void Synchronize(const char* tag) {} |
| #endif |
| }; |
| |
| |
| // BooleanBit is a helper class for setting and getting a bit in an |
| // integer or Smi. |
| class BooleanBit : public AllStatic { |
| public: |
| static inline bool get(Smi* smi, int bit_position) { |
| return get(smi->value(), bit_position); |
| } |
| |
| static inline bool get(int value, int bit_position) { |
| return (value & (1 << bit_position)) != 0; |
| } |
| |
| static inline Smi* set(Smi* smi, int bit_position, bool v) { |
| return Smi::FromInt(set(smi->value(), bit_position, v)); |
| } |
| |
| static inline int set(int value, int bit_position, bool v) { |
| if (v) { |
| value |= (1 << bit_position); |
| } else { |
| value &= ~(1 << bit_position); |
| } |
| return value; |
| } |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_OBJECTS_H_ |