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Diffstat (limited to 'V8Binding/v8/src/objects.h')
| -rw-r--r-- | V8Binding/v8/src/objects.h | 4889 |
1 files changed, 0 insertions, 4889 deletions
diff --git a/V8Binding/v8/src/objects.h b/V8Binding/v8/src/objects.h deleted file mode 100644 index e9430f5..0000000 --- a/V8Binding/v8/src/objects.h +++ /dev/null @@ -1,4889 +0,0 @@ -// Copyright 2006-2009 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 -// - Array -// - ByteArray -// - PixelArray -// - FixedArray -// - DescriptorArray -// - HashTable -// - Dictionary -// - SymbolTable -// - CompilationCacheTable -// - MapCache -// - Context -// - GlobalContext -// - String -// - SeqString -// - SeqAsciiString -// - SeqTwoByteString -// - ConsString -// - SlicedString -// - ExternalString -// - ExternalAsciiString -// - ExternalTwoByteString -// - HeapNumber -// - Code -// - Map -// - Oddball -// - Proxy -// - SharedFunctionInfo -// - Struct -// - AccessorInfo -// - AccessCheckInfo -// - InterceptorInfo -// - CallHandlerInfo -// - TemplateInfo -// - FunctionTemplateInfo -// - ObjectTemplateInfo -// - Script -// - 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_); } - - inline PropertyDetails AsDeleted(); - - 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; } - bool IsDeleted() { return DeletedField::decode(value_) != 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 DeletedField: public BitField<uint32_t, 6, 1> {}; - class IndexField: public BitField<uint32_t, 7, 31-7> {}; - - 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_ALL(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(JS_GLOBAL_PROPERTY_CELL_TYPE) \ - V(ODDBALL_TYPE) \ - V(PROXY_TYPE) \ - V(BYTE_ARRAY_TYPE) \ - V(PIXEL_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(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) \ - -#ifdef ENABLE_DEBUGGER_SUPPORT -#define INSTANCE_TYPE_LIST_DEBUGGER(V) \ - V(DEBUG_INFO_TYPE) \ - V(BREAK_POINT_INFO_TYPE) -#else -#define INSTANCE_TYPE_LIST_DEBUGGER(V) -#endif - -#define INSTANCE_TYPE_LIST(V) \ - INSTANCE_TYPE_LIST_ALL(V) \ - INSTANCE_TYPE_LIST_DEBUGGER(V) - - -// Since string types are not consecutive, this macro is used to -// iterate over them. -#define STRING_TYPE_LIST(V) \ - V(SHORT_SYMBOL_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - short_symbol, \ - ShortSymbol) \ - V(MEDIUM_SYMBOL_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - medium_symbol, \ - MediumSymbol) \ - V(LONG_SYMBOL_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - long_symbol, \ - LongSymbol) \ - V(SHORT_ASCII_SYMBOL_TYPE, \ - SeqAsciiString::kAlignedSize, \ - short_ascii_symbol, \ - ShortAsciiSymbol) \ - V(MEDIUM_ASCII_SYMBOL_TYPE, \ - SeqAsciiString::kAlignedSize, \ - medium_ascii_symbol, \ - MediumAsciiSymbol) \ - V(LONG_ASCII_SYMBOL_TYPE, \ - SeqAsciiString::kAlignedSize, \ - long_ascii_symbol, \ - LongAsciiSymbol) \ - V(SHORT_CONS_SYMBOL_TYPE, \ - ConsString::kSize, \ - short_cons_symbol, \ - ShortConsSymbol) \ - V(MEDIUM_CONS_SYMBOL_TYPE, \ - ConsString::kSize, \ - medium_cons_symbol, \ - MediumConsSymbol) \ - V(LONG_CONS_SYMBOL_TYPE, \ - ConsString::kSize, \ - long_cons_symbol, \ - LongConsSymbol) \ - V(SHORT_CONS_ASCII_SYMBOL_TYPE, \ - ConsString::kSize, \ - short_cons_ascii_symbol, \ - ShortConsAsciiSymbol) \ - V(MEDIUM_CONS_ASCII_SYMBOL_TYPE, \ - ConsString::kSize, \ - medium_cons_ascii_symbol, \ - MediumConsAsciiSymbol) \ - V(LONG_CONS_ASCII_SYMBOL_TYPE, \ - ConsString::kSize, \ - long_cons_ascii_symbol, \ - LongConsAsciiSymbol) \ - V(SHORT_SLICED_SYMBOL_TYPE, \ - SlicedString::kSize, \ - short_sliced_symbol, \ - ShortSlicedSymbol) \ - V(MEDIUM_SLICED_SYMBOL_TYPE, \ - SlicedString::kSize, \ - medium_sliced_symbol, \ - MediumSlicedSymbol) \ - V(LONG_SLICED_SYMBOL_TYPE, \ - SlicedString::kSize, \ - long_sliced_symbol, \ - LongSlicedSymbol) \ - V(SHORT_SLICED_ASCII_SYMBOL_TYPE, \ - SlicedString::kSize, \ - short_sliced_ascii_symbol, \ - ShortSlicedAsciiSymbol) \ - V(MEDIUM_SLICED_ASCII_SYMBOL_TYPE, \ - SlicedString::kSize, \ - medium_sliced_ascii_symbol, \ - MediumSlicedAsciiSymbol) \ - V(LONG_SLICED_ASCII_SYMBOL_TYPE, \ - SlicedString::kSize, \ - long_sliced_ascii_symbol, \ - LongSlicedAsciiSymbol) \ - V(SHORT_EXTERNAL_SYMBOL_TYPE, \ - ExternalTwoByteString::kSize, \ - short_external_symbol, \ - ShortExternalSymbol) \ - V(MEDIUM_EXTERNAL_SYMBOL_TYPE, \ - ExternalTwoByteString::kSize, \ - medium_external_symbol, \ - MediumExternalSymbol) \ - V(LONG_EXTERNAL_SYMBOL_TYPE, \ - ExternalTwoByteString::kSize, \ - long_external_symbol, \ - LongExternalSymbol) \ - V(SHORT_EXTERNAL_ASCII_SYMBOL_TYPE, \ - ExternalAsciiString::kSize, \ - short_external_ascii_symbol, \ - ShortExternalAsciiSymbol) \ - V(MEDIUM_EXTERNAL_ASCII_SYMBOL_TYPE, \ - ExternalAsciiString::kSize, \ - medium_external_ascii_symbol, \ - MediumExternalAsciiSymbol) \ - V(LONG_EXTERNAL_ASCII_SYMBOL_TYPE, \ - ExternalAsciiString::kSize, \ - long_external_ascii_symbol, \ - LongExternalAsciiSymbol) \ - V(SHORT_STRING_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - short_string, \ - ShortString) \ - V(MEDIUM_STRING_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - medium_string, \ - MediumString) \ - V(LONG_STRING_TYPE, \ - SeqTwoByteString::kAlignedSize, \ - long_string, \ - LongString) \ - V(SHORT_ASCII_STRING_TYPE, \ - SeqAsciiString::kAlignedSize, \ - short_ascii_string, \ - ShortAsciiString) \ - V(MEDIUM_ASCII_STRING_TYPE, \ - SeqAsciiString::kAlignedSize, \ - medium_ascii_string, \ - MediumAsciiString) \ - V(LONG_ASCII_STRING_TYPE, \ - SeqAsciiString::kAlignedSize, \ - long_ascii_string, \ - LongAsciiString) \ - V(SHORT_CONS_STRING_TYPE, \ - ConsString::kSize, \ - short_cons_string, \ - ShortConsString) \ - V(MEDIUM_CONS_STRING_TYPE, \ - ConsString::kSize, \ - medium_cons_string, \ - MediumConsString) \ - V(LONG_CONS_STRING_TYPE, \ - ConsString::kSize, \ - long_cons_string, \ - LongConsString) \ - V(SHORT_CONS_ASCII_STRING_TYPE, \ - ConsString::kSize, \ - short_cons_ascii_string, \ - ShortConsAsciiString) \ - V(MEDIUM_CONS_ASCII_STRING_TYPE, \ - ConsString::kSize, \ - medium_cons_ascii_string, \ - MediumConsAsciiString) \ - V(LONG_CONS_ASCII_STRING_TYPE, \ - ConsString::kSize, \ - long_cons_ascii_string, \ - LongConsAsciiString) \ - V(SHORT_SLICED_STRING_TYPE, \ - SlicedString::kSize, \ - short_sliced_string, \ - ShortSlicedString) \ - V(MEDIUM_SLICED_STRING_TYPE, \ - SlicedString::kSize, \ - medium_sliced_string, \ - MediumSlicedString) \ - V(LONG_SLICED_STRING_TYPE, \ - SlicedString::kSize, \ - long_sliced_string, \ - LongSlicedString) \ - V(SHORT_SLICED_ASCII_STRING_TYPE, \ - SlicedString::kSize, \ - short_sliced_ascii_string, \ - ShortSlicedAsciiString) \ - V(MEDIUM_SLICED_ASCII_STRING_TYPE, \ - SlicedString::kSize, \ - medium_sliced_ascii_string, \ - MediumSlicedAsciiString) \ - V(LONG_SLICED_ASCII_STRING_TYPE, \ - SlicedString::kSize, \ - long_sliced_ascii_string, \ - LongSlicedAsciiString) \ - V(SHORT_EXTERNAL_STRING_TYPE, \ - ExternalTwoByteString::kSize, \ - short_external_string, \ - ShortExternalString) \ - V(MEDIUM_EXTERNAL_STRING_TYPE, \ - ExternalTwoByteString::kSize, \ - medium_external_string, \ - MediumExternalString) \ - V(LONG_EXTERNAL_STRING_TYPE, \ - ExternalTwoByteString::kSize, \ - long_external_string, \ - LongExternalString) \ - V(SHORT_EXTERNAL_ASCII_STRING_TYPE, \ - ExternalAsciiString::kSize, \ - short_external_ascii_string, \ - ShortExternalAsciiString) \ - V(MEDIUM_EXTERNAL_ASCII_STRING_TYPE, \ - ExternalAsciiString::kSize, \ - medium_external_ascii_string, \ - MediumExternalAsciiString) \ - V(LONG_EXTERNAL_ASCII_STRING_TYPE, \ - ExternalAsciiString::kSize, \ - long_external_ascii_string, \ - LongExternalAsciiString) - -// 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, - JS_GLOBAL_PROPERTY_CELL_TYPE, - PROXY_TYPE, - BYTE_ARRAY_TYPE, - PIXEL_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, -#ifdef ENABLE_DEBUGGER_SUPPORT - DEBUG_INFO_TYPE, - BREAK_POINT_INFO_TYPE, -#endif - 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(); -#ifdef DEBUG - // See objects-inl.h for more details - inline bool IsSeqString(); - inline bool IsSlicedString(); - inline bool IsExternalString(); - inline bool IsExternalTwoByteString(); - inline bool IsExternalAsciiString(); - inline bool IsSeqTwoByteString(); - inline bool IsSeqAsciiString(); -#endif // DEBUG - inline bool IsConsString(); - - inline bool IsNumber(); - inline bool IsByteArray(); - inline bool IsPixelArray(); - 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 IsPrimitive(); - inline bool IsGlobalObject(); - inline bool IsJSGlobalObject(); - inline bool IsJSBuiltinsObject(); - inline bool IsJSGlobalProxy(); - inline bool IsUndetectableObject(); - inline bool IsAccessCheckNeeded(); - inline bool IsJSGlobalPropertyCell(); - - // Returns true if this object is an instance of the specified - // function template. - inline 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. -// Smi stands for small integer. -// The this pointer has the following format: [31 bit signed int] 0 -// On 64-bit, the top 32 bits of the pointer is allowed to have any -// value. -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(intptr_t 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 object graph. -// -// Failures are a single word, encoded as follows: -// +-------------------------+---+--+--+ -// |rrrrrrrrrrrrrrrrrrrrrrrrr|sss|tt|11| -// +-------------------------+---+--+--+ -// 3 7 6 4 32 10 -// 1 -// -// 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 -// allocation spaces (the encoding is found in globals.h). -// -// The remaining bits is the size of the allocation request in units -// of the pointer size, 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(); - - // 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); - - private: - // HeapObject calls the private constructor and directly reads the value. - friend class HeapObject; - - explicit MapWord(uintptr_t value) : value_(value) {} - - uintptr_t value_; -}; - - -// 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; - - STATIC_CHECK(kMapOffset == Internals::kHeapObjectMapOffset); - - 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; - // IEEE doubles are two 32 bit words. The first is just mantissa, the second - // is a mixture of sign, exponent and mantissa. Our current platforms are all - // little endian apart from non-EABI arm which is little endian with big - // endian floating point word ordering! -#if !defined(V8_HOST_ARCH_ARM) || __ARM_EABI__ - static const int kMantissaOffset = kValueOffset; - static const int kExponentOffset = kValueOffset + 4; -#else - static const int kMantissaOffset = kValueOffset + 4; - static const int kExponentOffset = kValueOffset; -# define BIG_ENDIAN_FLOATING_POINT 1 -#endif - static const int kSize = kValueOffset + kDoubleSize; - - static const uint32_t kSignMask = 0x80000000u; - static const uint32_t kExponentMask = 0x7ff00000u; - static const uint32_t kMantissaMask = 0xfffffu; - static const int kExponentBias = 1023; - static const int kExponentShift = 20; - static const int kMantissaBitsInTopWord = 20; - static const int kNonMantissaBitsInTopWord = 12; - - 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: - enum DeleteMode { NORMAL_DELETION, FORCE_DELETION }; - enum ElementsKind { - FAST_ELEMENTS, - DICTIONARY_ELEMENTS, - PIXEL_ELEMENTS - }; - - // [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 StringDictionary* 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 or a PixelArray in a special case. - DECL_ACCESSORS(elements, Array) // Get and set fast elements. - inline void initialize_elements(); - inline ElementsKind GetElementsKind(); - inline bool HasFastElements(); - inline bool HasDictionaryElements(); - inline bool HasPixelElements(); - inline NumberDictionary* 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); - - // Retrieve a value in a normalized object given a lookup result. - // Handles the special representation of JS global objects. - Object* GetNormalizedProperty(LookupResult* result); - - // Sets the property value in a normalized object given a lookup result. - // Handles the special representation of JS global objects. - Object* SetNormalizedProperty(LookupResult* result, Object* value); - - // Sets the property value in a normalized object given (key, value, details). - // Handles the special representation of JS global objects. - Object* SetNormalizedProperty(String* name, - Object* value, - PropertyDetails details); - - // Deletes the named property in a normalized object. - Object* DeleteNormalizedProperty(String* name, DeleteMode mode); - - // 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(); - - // Returns the constructor name (the name (possibly, inferred name) of the - // function that was used to instantiate the object). - String* constructor_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(); - - // Returns true if this is an instance of an api function and has - // been modified since it was created. May give false positives. - bool IsDirty(); - - 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, DeleteMode mode); - Object* DeleteElement(uint32_t index, DeleteMode mode); - Object* DeleteLazyProperty(LookupResult* result, - String* name, - DeleteMode mode); - - // 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. If the object is expected to have additional properties - // added this number can be indicated to have the backing store allocated to - // an initial capacity for holding these properties. - Object* NormalizeProperties(PropertyNormalizationMode mode, - int expected_additional_properties); - 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; - - STATIC_CHECK(kHeaderSize == Internals::kJSObjectHeaderSize); - - Object* GetElementWithInterceptor(JSObject* receiver, uint32_t index); - - private: - Object* SetElementWithInterceptor(uint32_t index, Object* value); - Object* SetElementWithoutInterceptor(uint32_t index, Object* value); - - Object* GetElementPostInterceptor(JSObject* receiver, uint32_t index); - - Object* DeletePropertyPostInterceptor(String* name, DeleteMode mode); - Object* DeletePropertyWithInterceptor(String* name); - - Object* DeleteElementPostInterceptor(uint32_t index, DeleteMode mode); - 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; - - protected: - // No code should use the Array class directly, only its subclasses. - // Use the kHeaderSize of the appropriate subclass, which may be aligned. - static const int kHeaderSize = kLengthOffset + kIntSize; - static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize); - - 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; } - - // Code Generation support. - static int OffsetOfElementAt(int index) { return SizeFor(index); } - - // Casting. - static inline FixedArray* cast(Object* obj); - - // Align data at kPointerSize, even if Array.kHeaderSize isn't aligned. - static const int kHeaderSize = POINTER_SIZE_ALIGN(Array::kHeaderSize); - - // 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); - inline PropertyType GetType(int descriptor_number); - inline int GetFieldIndex(int descriptor_number); - inline JSFunction* GetConstantFunction(int descriptor_number); - inline Object* GetCallbacksObject(int descriptor_number); - inline AccessorDescriptor* GetCallbacks(int descriptor_number); - inline bool IsProperty(int descriptor_number); - inline bool IsTransition(int descriptor_number); - inline bool IsNullDescriptor(int descriptor_number); - inline bool IsDontEnum(int descriptor_number); - - // Accessor for complete descriptor. - inline void Get(int descriptor_number, Descriptor* desc); - inline void Set(int descriptor_number, Descriptor* desc); - - // Transfer complete descriptor from another descriptor array to - // this one. - inline void CopyFrom(int index, DescriptorArray* src, int src_index); - - // 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 Shape and a Key. -// Shape must be a class with the following interface: -// class ExampleShape { -// public: -// // Tells whether key matches other. -// static bool IsMatch(Key key, Object* other); -// // Returns the hash value for key. -// static uint32_t Hash(Key key); -// // Returns the hash value for object. -// static uint32_t HashForObject(Key key, Object* object); -// // Convert key to an object. -// static inline Object* AsObject(Key key); -// // The prefix size indicates number of elements in the beginning -// // of the backing storage. -// static const int kPrefixSize = ..; -// // The Element size indicates number of elements per entry. -// static const int kEntrySize = ..; -// }; -// 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. - -template<typename Shape, typename Key> -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 + Shape::kPrefixSize; - static const int kEntrySize = Shape::kEntrySize; - static const int kElementsStartOffset = - kHeaderSize + kElementsStartIndex * kPointerSize; - - // Constant used for denoting a absent entry. - static const int kNotFound = -1; - - // Find entry for key otherwise return -1. - int FindEntry(Key key); - - protected: - - // Find the entry at which to insert element with the given key that - // has the given hash value. - uint32_t FindInsertionEntry(uint32_t hash); - - // Returns the index for an entry (of the key) - static inline int EntryToIndex(int entry) { - return (entry * kEntrySize) + 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, Key key); -}; - - - -// HashTableKey is an abstract superclass for virtual key behavior. -class HashTableKey { - public: - // Returns whether the other object matches this key. - virtual bool IsMatch(Object* other) = 0; - // Returns the hash value for this key. - virtual uint32_t Hash() = 0; - // Returns the hash value for object. - virtual uint32_t HashForObject(Object* key) = 0; - // Returns the key object for storing into the dictionary. - // If allocations fails a failure object is returned. - virtual Object* AsObject() = 0; - // Required. - virtual ~HashTableKey() {} -}; - -class SymbolTableShape { - public: - static bool IsMatch(HashTableKey* key, Object* value) { - return key->IsMatch(value); - } - static uint32_t Hash(HashTableKey* key) { - return key->Hash(); - } - static uint32_t HashForObject(HashTableKey* key, Object* object) { - return key->HashForObject(object); - } - static Object* AsObject(HashTableKey* key) { - return key->AsObject(); - } - - static const int kPrefixSize = 0; - static const int kEntrySize = 1; -}; - -// 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<SymbolTableShape, HashTableKey*> { - 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); -}; - - -class MapCacheShape { - public: - static bool IsMatch(HashTableKey* key, Object* value) { - return key->IsMatch(value); - } - static uint32_t Hash(HashTableKey* key) { - return key->Hash(); - } - - static uint32_t HashForObject(HashTableKey* key, Object* object) { - return key->HashForObject(object); - } - - static Object* AsObject(HashTableKey* key) { - return key->AsObject(); - } - - static const int kPrefixSize = 0; - static const int kEntrySize = 2; -}; - - -// MapCache. -// -// Maps keys that are a fixed array of symbols to a map. -// Used for canonicalize maps for object literals. -class MapCache: public HashTable<MapCacheShape, HashTableKey*> { - 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); -}; - - -template <typename Shape, typename Key> -class Dictionary: public HashTable<Shape, Key> { - public: - - static inline Dictionary<Shape, Key>* cast(Object* obj) { - return reinterpret_cast<Dictionary<Shape, Key>*>(obj); - } - - // Returns the value at entry. - Object* ValueAt(int entry) { - return get(HashTable<Shape, Key>::EntryToIndex(entry)+1); - } - - // Set the value for entry. - void ValueAtPut(int entry, Object* value) { - set(HashTable<Shape, Key>::EntryToIndex(entry)+1, value); - } - - // Returns the property details for the property at entry. - PropertyDetails DetailsAt(int entry) { - ASSERT(entry >= 0); // Not found is -1, which is not caught by get(). - return PropertyDetails( - Smi::cast(get(HashTable<Shape, Key>::EntryToIndex(entry) + 2))); - } - - // Set the details for entry. - void DetailsAtPut(int entry, PropertyDetails value) { - set(HashTable<Shape, Key>::EntryToIndex(entry) + 2, value.AsSmi()); - } - - // Sorting support - void CopyValuesTo(FixedArray* elements); - - // Delete a property from the dictionary. - Object* DeleteProperty(int entry, JSObject::DeleteMode mode); - - // 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); - // Fill in details for properties into storage. - void CopyKeysTo(FixedArray* storage); - - // Accessors for next enumeration index. - void SetNextEnumerationIndex(int index) { - fast_set(this, kNextEnumerationIndexIndex, Smi::FromInt(index)); - } - - int NextEnumerationIndex() { - return Smi::cast(FixedArray::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, Key key); - -#ifdef DEBUG - void Print(); -#endif - // Returns the key (slow). - Object* SlowReverseLookup(Object* value); - - // Sets the entry to (key, value) pair. - inline void SetEntry(int entry, - Object* key, - Object* value, - PropertyDetails details); - - Object* Add(Key key, Object* value, PropertyDetails details); - - protected: - // Generic at put operation. - Object* AtPut(Key key, Object* value); - - // Add entry to dictionary. - Object* AddEntry(Key key, - Object* value, - PropertyDetails details, - uint32_t hash); - - // Generate new enumeration indices to avoid enumeration index overflow. - Object* GenerateNewEnumerationIndices(); - static const int kMaxNumberKeyIndex = - HashTable<Shape, Key>::kPrefixStartIndex; - static const int kNextEnumerationIndexIndex = kMaxNumberKeyIndex + 1; -}; - - -class StringDictionaryShape { - public: - static inline bool IsMatch(String* key, Object* other); - static inline uint32_t Hash(String* key); - static inline uint32_t HashForObject(String* key, Object* object); - static inline Object* AsObject(String* key); - static const int kPrefixSize = 2; - static const int kEntrySize = 3; - static const bool kIsEnumerable = true; -}; - - -class StringDictionary: public Dictionary<StringDictionaryShape, String*> { - public: - static inline StringDictionary* cast(Object* obj) { - ASSERT(obj->IsDictionary()); - return reinterpret_cast<StringDictionary*>(obj); - } - - // Copies enumerable keys to preallocated fixed array. - void CopyEnumKeysTo(FixedArray* storage, FixedArray* sort_array); - - // For transforming properties of a JSObject. - Object* TransformPropertiesToFastFor(JSObject* obj, - int unused_property_fields); -}; - - -class NumberDictionaryShape { - public: - static inline bool IsMatch(uint32_t key, Object* other); - static inline uint32_t Hash(uint32_t key); - static inline uint32_t HashForObject(uint32_t key, Object* object); - static inline Object* AsObject(uint32_t key); - static const int kPrefixSize = 2; - static const int kEntrySize = 3; - static const bool kIsEnumerable = false; -}; - - -class NumberDictionary: public Dictionary<NumberDictionaryShape, uint32_t> { - public: - static NumberDictionary* cast(Object* obj) { - ASSERT(obj->IsDictionary()); - return reinterpret_cast<NumberDictionary*>(obj); - } - - // Type specific at put (default NONE attributes is used when adding). - Object* AtNumberPut(uint32_t key, Object* value); - Object* AddNumberEntry(uint32_t key, - Object* value, - PropertyDetails details); - - // Set an existing entry or add a new one if needed. - Object* Set(uint32_t key, Object* value, PropertyDetails details); - - void UpdateMaxNumberKey(uint32_t key); - - // 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(); - - // Remove all entries were key is a number and (from <= key && key < to). - void RemoveNumberEntries(uint32_t from, uint32_t to); - - // Bit masks. - static const int kRequiresSlowElementsMask = 1; - static const int kRequiresSlowElementsTagSize = 1; - static const uint32_t kRequiresSlowElementsLimit = (1 << 29) - 1; -}; - - -// 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 OBJECT_SIZE_ALIGN(kHeaderSize + 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 - - // ByteArray headers are not quadword aligned. - static const int kHeaderSize = Array::kHeaderSize; - static const int kAlignedSize = Array::kAlignedSize; - - private: - DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray); -}; - - -// A PixelArray represents a fixed-size byte array with special semantics -// used for implementing the CanvasPixelArray object. Please see the -// specification at: -// http://www.whatwg.org/specs/web-apps/current-work/ -// multipage/the-canvas-element.html#canvaspixelarray -// In particular, write access clamps the value written to 0 or 255 if the -// value written is outside this range. -class PixelArray: public Array { - public: - // [external_pointer]: The pointer to the external memory area backing this - // pixel array. - DECL_ACCESSORS(external_pointer, uint8_t) // Pointer to the data store. - - // Setter and getter. - inline uint8_t get(int index); - inline void set(int index, uint8_t value); - - // This accessor applies the correct conversion from Smi, HeapNumber and - // undefined and clamps the converted value between 0 and 255. - Object* SetValue(uint32_t index, Object* value); - - // Casting. - static inline PixelArray* cast(Object* obj); - -#ifdef DEBUG - void PixelArrayPrint(); - void PixelArrayVerify(); -#endif // DEBUG - - // PixelArray headers are not quadword aligned. - static const int kExternalPointerOffset = Array::kAlignedSize; - static const int kHeaderSize = kExternalPointerOffset + kPointerSize; - static const int kAlignedSize = OBJECT_SIZE_ALIGN(kHeaderSize); - - private: - DISALLOW_IMPLICIT_CONSTRUCTORS(PixelArray); -}; - - -// 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 - }; - -#ifdef ENABLE_DISASSEMBLER - // Printing - static const char* Kind2String(Kind kind); - static const char* ICState2String(InlineCacheState state); - static const char* PropertyType2String(PropertyType type); - 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 InLoopFlag ic_in_loop(); // 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; } - - // [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, - InLoopFlag in_loop = NOT_IN_LOOP, - InlineCacheState ic_state = UNINITIALIZED, - PropertyType type = NORMAL, - int argc = -1); - - static inline Flags ComputeMonomorphicFlags( - Kind kind, - PropertyType type, - InLoopFlag in_loop = NOT_IN_LOOP, - int argc = -1); - - static inline Kind ExtractKindFromFlags(Flags flags); - static inline InlineCacheState ExtractICStateFromFlags(Flags flags); - static inline InLoopFlag ExtractICInLoopFromFlags(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(); - - // 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(static_cast<int>(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 - // Code entry points are aligned to 32 bytes. - static const int kCodeAlignment = 32; - static const int kCodeAlignmentMask = kCodeAlignment - 1; - - // 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 padding to align the instruction start following right after - // the Code object header. - static const int kHeaderSize = - (kKindSpecificFlagsOffset + kIntSize + kCodeAlignmentMask) & - ~kCodeAlignmentMask; - - // Byte offsets within kKindSpecificFlagsOffset. - static const int kStubMajorKeyOffset = kKindSpecificFlagsOffset + 1; - - // Flags layout. - static const int kFlagsICStateShift = 0; - static const int kFlagsICInLoopShift = 3; - static const int kFlagsKindShift = 4; - static const int kFlagsTypeShift = 7; - static const int kFlagsArgumentsCountShift = 10; - - static const int kFlagsICStateMask = 0x00000007; // 0000000111 - static const int kFlagsICInLoopMask = 0x00000008; // 0000001000 - static const int kFlagsKindMask = 0x00000070; // 0001110000 - static const int kFlagsTypeMask = 0x00000380; // 1110000000 - static const int kFlagsArgumentsCountMask = 0xFFFFFC00; - - static const int kFlagsNotUsedInLookup = - (kFlagsICInLoopMask | kFlagsTypeMask); - - 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); - - // Count of property fields pre-allocated in the object when first allocated. - inline int pre_allocated_property_fields(); - inline void set_pre_allocated_property_fields(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; - } - - // Records and queries 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; - } - - // Records and queries whether the instance has an indexed 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 - - static const int kMaxPreAllocatedPropertyFields = 255; - - // 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 + kPointerSize; - - // Byte offsets within kInstanceSizesOffset. - static const int kInstanceSizeOffset = kInstanceSizesOffset + 0; - static const int kInObjectPropertiesByte = 1; - static const int kInObjectPropertiesOffset = - kInstanceSizesOffset + kInObjectPropertiesByte; - static const int kPreAllocatedPropertyFieldsByte = 2; - static const int kPreAllocatedPropertyFieldsOffset = - kInstanceSizesOffset + kPreAllocatedPropertyFieldsByte; - // The byte at position 3 is 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; - - STATIC_CHECK(kInstanceTypeOffset == Internals::kMapInstanceTypeOffset); - - // 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 bit 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 describes a script which has been added to the VM. -class Script: public Struct { - public: - // Script types. - enum Type { - TYPE_NATIVE = 0, - TYPE_EXTENSION = 1, - TYPE_NORMAL = 2 - }; - - // Script compilation types. - enum CompilationType { - COMPILATION_TYPE_HOST = 0, - COMPILATION_TYPE_EVAL = 1, - COMPILATION_TYPE_JSON = 2 - }; - - // [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) - - // [compilation]: how the the script was compiled. - DECL_ACCESSORS(compilation_type, Smi) - - // [line_ends]: array of line ends positions. - DECL_ACCESSORS(line_ends, Object) - - // [eval_from_function]: for eval scripts the funcion from which eval was - // called. - DECL_ACCESSORS(eval_from_function, Object) - - // [eval_from_instructions_offset]: the instruction offset in the code for the - // function from which eval was called where eval was called. - DECL_ACCESSORS(eval_from_instructions_offset, Smi) - - 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 kCompilationTypeOffset = kTypeOffset + kPointerSize; - static const int kLineEndsOffset = kCompilationTypeOffset + kPointerSize; - static const int kIdOffset = kLineEndsOffset + kPointerSize; - static const int kEvalFromFunctionOffset = kIdOffset + kPointerSize; - static const int kEvalFrominstructionsOffsetOffset = - kEvalFromFunctionOffset + kPointerSize; - static const int kSize = kEvalFrominstructionsOffsetOffset + 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) - - // [construct stub]: Code stub for constructing instances of this function. - DECL_ACCESSORS(construct_stub, 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 (scripts, evals). - inline bool is_toplevel(); - inline void set_is_toplevel(bool value); - - // Bit field containing various information collected by the compiler to - // drive optimization. - inline int compiler_hints(); - inline void set_compiler_hints(int value); - - // Add information on assignments of the form this.x = ...; - void SetThisPropertyAssignmentsInfo( - bool has_only_this_property_assignments, - bool has_only_simple_this_property_assignments, - FixedArray* this_property_assignments); - - // Clear information on assignments of the form this.x = ...; - void ClearThisPropertyAssignmentsInfo(); - - // Indicate that this function only consists of assignments of the form - // this.x = ...;. - inline bool has_only_this_property_assignments(); - - // Indicate that this function only consists of assignments of the form - // this.x = y; where y is either a constant or refers to an argument. - inline bool has_only_simple_this_property_assignments(); - - // For functions which only contains this property assignments this provides - // access to the names for the properties assigned. - DECL_ACCESSORS(this_property_assignments, Object) - inline int this_property_assignments_count(); - inline void set_this_property_assignments_count(int value); - String* GetThisPropertyAssignmentName(int index); - bool IsThisPropertyAssignmentArgument(int index); - int GetThisPropertyAssignmentArgument(int index); - Object* GetThisPropertyAssignmentConstant(int index); - - // [source code]: Source code for the function. - bool HasSourceCode(); - Object* GetSourceCode(); - - // Calculate the instance size. - int CalculateInstanceSize(); - - // Calculate the number of in-object properties. - int CalculateInObjectProperties(); - - // 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. - // (An even number of integers has a size that is a multiple of a pointer.) - static const int kNameOffset = HeapObject::kHeaderSize; - static const int kCodeOffset = kNameOffset + kPointerSize; - static const int kConstructStubOffset = kCodeOffset + kPointerSize; - static const int kLengthOffset = kConstructStubOffset + kPointerSize; - static const int kFormalParameterCountOffset = kLengthOffset + kIntSize; - static const int kExpectedNofPropertiesOffset = - kFormalParameterCountOffset + kIntSize; - static const int kStartPositionAndTypeOffset = - kExpectedNofPropertiesOffset + kIntSize; - static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize; - static const int kFunctionTokenPositionOffset = kEndPositionOffset + kIntSize; - static const int kInstanceClassNameOffset = - kFunctionTokenPositionOffset + kIntSize; - static const int kExternalReferenceDataOffset = - kInstanceClassNameOffset + kPointerSize; - static const int kScriptOffset = kExternalReferenceDataOffset + kPointerSize; - static const int kDebugInfoOffset = kScriptOffset + kPointerSize; - static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize; - static const int kCompilerHintsOffset = kInferredNameOffset + kPointerSize; - static const int kThisPropertyAssignmentsOffset = - kCompilerHintsOffset + kPointerSize; - static const int kThisPropertyAssignmentsCountOffset = - kThisPropertyAssignmentsOffset + kPointerSize; - static const int kSize = kThisPropertyAssignmentsCountOffset + 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); - - // Bit positions in compiler_hints. - static const int kHasOnlyThisPropertyAssignments = 0; - static const int kHasOnlySimpleThisPropertyAssignments = 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(); - - // Tells whether this function is builtin. - inline bool IsBuiltin(); - - // [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) - - // Retrieve the property cell used to store a property. - Object* GetPropertyCell(LookupResult* result); - - // Ensure that the global object has a cell for the given property name. - Object* EnsurePropertyCell(String* name); - - // 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 int code_index(bool is_ascii) { - if (is_ascii) { - return kIrregexpASCIICodeIndex; - } else { - return kIrregexpUC16CodeIndex; - } - } - - static inline JSRegExp* cast(Object* obj); - - // Dispatched behavior. -#ifdef DEBUG - void JSRegExpVerify(); -#endif - - static const int kDataOffset = JSObject::kHeaderSize; - static const int kSize = kDataOffset + kPointerSize; - - // 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. If compilation - // fails, this fields hold an exception object that should be - // thrown if the regexp is used again. - static const int kIrregexpASCIICodeIndex = kDataIndex; - // Irregexp compiled code or bytecode for UC16. If compilation - // fails, this fields hold an exception object that should be - // thrown if the regexp is used again. - 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 CompilationCacheShape { - public: - static inline bool IsMatch(HashTableKey* key, Object* value) { - return key->IsMatch(value); - } - - static inline uint32_t Hash(HashTableKey* key) { - return key->Hash(); - } - - static inline uint32_t HashForObject(HashTableKey* key, Object* object) { - return key->HashForObject(object); - } - - static Object* AsObject(HashTableKey* key) { - return key->AsObject(); - } - - static const int kPrefixSize = 0; - static const int kEntrySize = 2; -}; - -class CompilationCacheTable: public HashTable<CompilationCacheShape, - HashTableKey*> { - 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; - // Notice: kSize is not pointer-size aligned if pointers are 64-bit. - - // 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 OBJECT_SIZE_ALIGN(kHeaderSize + length * kCharSize); - } - - // Layout description. - static const int kHeaderSize = String::kSize; - static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize); - - // 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 OBJECT_SIZE_ALIGN(kHeaderSize + length * kShortSize); - } - - // Layout description. - static const int kHeaderSize = String::kSize; - static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize); - - // 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 = POINTER_SIZE_ALIGN(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 -#if V8_HOST_ARCH_64_BIT - // Optimizations expect buffer to be located at same offset as a ConsString's - // first substring. In 64 bit mode we have room for the start offset before - // the buffer. - static const int kStartOffset = String::kSize; - static const int kBufferOffset = kStartOffset + kIntSize; - static const int kSize = kBufferOffset + kPointerSize; -#else - static const int kBufferOffset = String::kSize; - static const int kStartOffset = kBufferOffset + kPointerSize; - static const int kSize = kStartOffset + kIntSize; -#endif - - // 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 = POINTER_SIZE_ALIGN(String::kSize); - static const int kSize = kResourceOffset + kPointerSize; - - STATIC_CHECK(kResourceOffset == Internals::kStringResourceOffset); - - 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); -}; - - -// Utility superclass for stack-allocated objects that must be updated -// on gc. It provides two ways for the gc to update instances, either -// iterating or updating after gc. -class Relocatable BASE_EMBEDDED { - public: - inline Relocatable() : prev_(top_) { top_ = this; } - virtual ~Relocatable() { - ASSERT_EQ(top_, this); - top_ = prev_; - } - virtual void IterateInstance(ObjectVisitor* v) { } - virtual void PostGarbageCollection() { } - - static void PostGarbageCollectionProcessing(); - static int ArchiveSpacePerThread(); - static char* ArchiveState(char* to); - static char* RestoreState(char* from); - static void Iterate(ObjectVisitor* v); - static void Iterate(ObjectVisitor* v, Relocatable* top); - static char* Iterate(ObjectVisitor* v, char* t); - private: - static Relocatable* top_; - Relocatable* prev_; -}; - - -// 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 : public Relocatable { - public: - explicit FlatStringReader(Handle<String> str); - explicit FlatStringReader(Vector<const char> input); - void PostGarbageCollection(); - inline uc32 Get(int index); - int length() { return length_; } - private: - String** str_; - bool is_ascii_; - int length_; - const void* start_; -}; - - -// 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); -}; - - -class JSGlobalPropertyCell: public HeapObject { - public: - // [value]: value of the global property. - DECL_ACCESSORS(value, Object) - - // Casting. - static inline JSGlobalPropertyCell* cast(Object* obj); - - // Dispatched behavior. - void JSGlobalPropertyCellIterateBody(ObjectVisitor* v); -#ifdef DEBUG - void JSGlobalPropertyCellVerify(); - void JSGlobalPropertyCellPrint(); -#endif - - // Layout description. - static const int kValueOffset = HeapObject::kHeaderSize; - static const int kSize = kValueOffset + kPointerSize; - - private: - DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalPropertyCell); -}; - - - -// 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; - - STATIC_CHECK(kProxyOffset == Internals::kProxyProxyOffset); - - 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. - inline void EnsureSize(int minimum_size_of_backing_fixed_array); - - // Dispatched behavior. -#ifdef DEBUG - void JSArrayPrint(); - void JSArrayVerify(); -#endif - - // Number of element slots to pre-allocate for an empty array. - static const int kPreallocatedArrayElements = 4; - - // Layout description. - static const int kLengthOffset = JSObject::kHeaderSize; - static const int kSize = kLengthOffset + kPointerSize; - - private: - // Expand the fixed array backing of a fast-case JSArray to at least - // the requested size. - void Expand(int minimum_size_of_backing_fixed_array); - - 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. -// -// If the accessor in the prototype has the READ_ONLY property attribute, then -// a new value is added to the local object when the property is set. -// This shadows the accessor in the prototype. -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 + kPointerSize; -}; - - -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.. - - // 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); - - // 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_ |