程序包 cn.taketoday.bytecode

类 Symbol

java.lang.Object

cn.taketoday.bytecode.Symbol

直接已知子类:

SymbolTable.Entry

abstract class Symbol
extends Object

An entry of the constant pool, of the BootstrapMethods attribute, or of the (ASM specific) type table of a class.

作者:

Eric Bruneton

另请参阅:

• JVMS 4.4
• JVMS 4.7.23

字段概要

字段

修饰符和类型	字段	说明
(专用程序包) static final int	BOOTSTRAP_METHOD_TAG	The tag value of the BootstrapMethods attribute entries.
(专用程序包) static final int	CONSTANT_CLASS_TAG	The tag value of CONSTANT_Class_info JVMS structures.
(专用程序包) static final int	CONSTANT_DOUBLE_TAG	The tag value of CONSTANT_Double_info JVMS structures.
(专用程序包) static final int	CONSTANT_DYNAMIC_TAG	The tag value of CONSTANT_Dynamic_info JVMS structures.
(专用程序包) static final int	CONSTANT_FIELDREF_TAG	The tag value of CONSTANT_Fieldref_info JVMS structures.
(专用程序包) static final int	CONSTANT_FLOAT_TAG	The tag value of CONSTANT_Float_info JVMS structures.
(专用程序包) static final int	CONSTANT_INTEGER_TAG	The tag value of CONSTANT_Integer_info JVMS structures.
(专用程序包) static final int	CONSTANT_INTERFACE_METHODREF_TAG	The tag value of CONSTANT_InterfaceMethodref_info JVMS structures.
(专用程序包) static final int	CONSTANT_INVOKE_DYNAMIC_TAG	The tag value of CONSTANT_InvokeDynamic_info JVMS structures.
(专用程序包) static final int	CONSTANT_LONG_TAG	The tag value of CONSTANT_Long_info JVMS structures.
(专用程序包) static final int	CONSTANT_METHOD_HANDLE_TAG	The tag value of CONSTANT_MethodHandle_info JVMS structures.
(专用程序包) static final int	CONSTANT_METHOD_TYPE_TAG	The tag value of CONSTANT_MethodType_info JVMS structures.
(专用程序包) static final int	CONSTANT_METHODREF_TAG	The tag value of CONSTANT_Methodref_info JVMS structures.
(专用程序包) static final int	CONSTANT_MODULE_TAG	The tag value of CONSTANT_Module_info JVMS structures.
(专用程序包) static final int	CONSTANT_NAME_AND_TYPE_TAG	The tag value of CONSTANT_NameAndType_info JVMS structures.
(专用程序包) static final int	CONSTANT_PACKAGE_TAG	The tag value of CONSTANT_Package_info JVMS structures.
(专用程序包) static final int	CONSTANT_STRING_TAG	The tag value of CONSTANT_String_info JVMS structures.
(专用程序包) static final int	CONSTANT_UTF8_TAG	The tag value of CONSTANT_Utf8_info JVMS structures.
final long	data	The numeric value of this symbol.
final int	index	The index of this symbol in the constant pool, in the BootstrapMethods attribute, or in the (ASM specific) type table of a class (depending on the tag value).
int	info	Additional information about this symbol, generally computed lazily.
(专用程序包) static final int	MERGED_TYPE_TAG	The tag value of a merged type entry in the (ASM specific) type table of a class.
final String	name	The name of the class field or method corresponding to this symbol.
final String	owner	The internal name of the owner class of this symbol.
final int	tag	A tag indicating the type of this symbol.
(专用程序包) static final int	TYPE_TAG	The tag value of a normal type entry in the (ASM specific) type table of a class.
(专用程序包) static final int	UNINITIALIZED_TYPE_TAG	The tag value of an Frame.ITEM_UNINITIALIZED type entry in the type table of a class.
final String	value	The string value of this symbol.

构造器概要

构造器

构造器	说明
Symbol(int index, int tag, String owner, String name, String value, long data)	Constructs a new Symbol.

方法概要

修饰符和类型	方法	说明
(专用程序包) int	getArgumentsAndReturnSizes()	Returns the result Type.getArgumentsAndReturnSizes() on value.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

CONSTANT_CLASS_TAG

static final int CONSTANT_CLASS_TAG

The tag value of CONSTANT_Class_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_FIELDREF_TAG

static final int CONSTANT_FIELDREF_TAG

The tag value of CONSTANT_Fieldref_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_METHODREF_TAG

static final int CONSTANT_METHODREF_TAG

The tag value of CONSTANT_Methodref_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_INTERFACE_METHODREF_TAG

static final int CONSTANT_INTERFACE_METHODREF_TAG

The tag value of CONSTANT_InterfaceMethodref_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_STRING_TAG

static final int CONSTANT_STRING_TAG

The tag value of CONSTANT_String_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_INTEGER_TAG

static final int CONSTANT_INTEGER_TAG

The tag value of CONSTANT_Integer_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_FLOAT_TAG

static final int CONSTANT_FLOAT_TAG

The tag value of CONSTANT_Float_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_LONG_TAG

static final int CONSTANT_LONG_TAG

The tag value of CONSTANT_Long_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_DOUBLE_TAG

static final int CONSTANT_DOUBLE_TAG

The tag value of CONSTANT_Double_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_NAME_AND_TYPE_TAG

static final int CONSTANT_NAME_AND_TYPE_TAG

The tag value of CONSTANT_NameAndType_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_UTF8_TAG

static final int CONSTANT_UTF8_TAG

The tag value of CONSTANT_Utf8_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_METHOD_HANDLE_TAG

static final int CONSTANT_METHOD_HANDLE_TAG

The tag value of CONSTANT_MethodHandle_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_METHOD_TYPE_TAG

static final int CONSTANT_METHOD_TYPE_TAG

The tag value of CONSTANT_MethodType_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_DYNAMIC_TAG

static final int CONSTANT_DYNAMIC_TAG

The tag value of CONSTANT_Dynamic_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_INVOKE_DYNAMIC_TAG

static final int CONSTANT_INVOKE_DYNAMIC_TAG

The tag value of CONSTANT_InvokeDynamic_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_MODULE_TAG

static final int CONSTANT_MODULE_TAG

The tag value of CONSTANT_Module_info JVMS structures.

另请参阅:

• 常量字段值

CONSTANT_PACKAGE_TAG

static final int CONSTANT_PACKAGE_TAG

The tag value of CONSTANT_Package_info JVMS structures.

另请参阅:

• 常量字段值

BOOTSTRAP_METHOD_TAG

static final int BOOTSTRAP_METHOD_TAG

The tag value of the BootstrapMethods attribute entries.

另请参阅:

• 常量字段值

TYPE_TAG

static final int TYPE_TAG

The tag value of a normal type entry in the (ASM specific) type table of a class.

另请参阅:

• 常量字段值

UNINITIALIZED_TYPE_TAG

static final int UNINITIALIZED_TYPE_TAG

The tag value of an Frame.ITEM_UNINITIALIZED type entry in the type table of a class.

另请参阅:

• 常量字段值

MERGED_TYPE_TAG

static final int MERGED_TYPE_TAG

The tag value of a merged type entry in the (ASM specific) type table of a class.

另请参阅:

• 常量字段值

index

public final int index

The index of this symbol in the constant pool, in the BootstrapMethods attribute, or in the (ASM specific) type table of a class (depending on the tag value).

tag

public final int tag

A tag indicating the type of this symbol. Must be one of the static tag values defined in this class.

owner

public final String owner

The internal name of the owner class of this symbol. Only used for CONSTANT_FIELDREF_TAG, CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG, and CONSTANT_METHOD_HANDLE_TAG symbols.

name

public final String name

The name of the class field or method corresponding to this symbol. Only used for CONSTANT_FIELDREF_TAG, CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG, CONSTANT_NAME_AND_TYPE_TAG, CONSTANT_METHOD_HANDLE_TAG, CONSTANT_DYNAMIC_TAG and CONSTANT_INVOKE_DYNAMIC_TAG symbols.

value

public final String value

The string value of this symbol. This is:

• a field or method descriptor for CONSTANT_FIELDREF_TAG, CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG, CONSTANT_NAME_AND_TYPE_TAG, CONSTANT_METHOD_HANDLE_TAG, CONSTANT_METHOD_TYPE_TAG, CONSTANT_DYNAMIC_TAG and CONSTANT_INVOKE_DYNAMIC_TAG symbols,
• an arbitrary string for CONSTANT_UTF8_TAG and CONSTANT_STRING_TAG symbols,
• an internal class name for CONSTANT_CLASS_TAG, TYPE_TAG and UNINITIALIZED_TYPE_TAG symbols,
• null for the other types of symbol.

data

public final long data

The numeric value of this symbol. This is:

• the symbol's value for CONSTANT_INTEGER_TAG,CONSTANT_FLOAT_TAG, CONSTANT_LONG_TAG, CONSTANT_DOUBLE_TAG,
• the CONSTANT_MethodHandle_info reference_kind field value for CONSTANT_METHOD_HANDLE_TAG symbols,
• the CONSTANT_InvokeDynamic_info bootstrap_method_attr_index field value for CONSTANT_INVOKE_DYNAMIC_TAG symbols,
• the offset of a bootstrap method in the BootstrapMethods boostrap_methods array, for CONSTANT_DYNAMIC_TAG or BOOTSTRAP_METHOD_TAG symbols,
• the bytecode offset of the NEW instruction that created an Frame.ITEM_UNINITIALIZED type for UNINITIALIZED_TYPE_TAG symbols,
• the indices (in the class' type table) of two TYPE_TAG source types for MERGED_TYPE_TAG symbols,
• 0 for the other types of symbol.

info

public int info

Additional information about this symbol, generally computed lazily. Warning: the value of this field is ignored when comparing Symbol instances (to avoid duplicate entries in a SymbolTable). Therefore, this field should only contain data that can be computed from the other fields of this class. It contains:

• the Type.getArgumentsAndReturnSizes() of the symbol's method descriptor for CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG and CONSTANT_INVOKE_DYNAMIC_TAG symbols,
• the index in the InnerClasses_attribute 'classes' array (plus one) corresponding to this class, for CONSTANT_CLASS_TAG symbols,
• the index (in the class' type table) of the merged type of the two source types for MERGED_TYPE_TAG symbols,
• 0 for the other types of symbol, or if this field has not been computed yet.

构造器详细资料

Symbol

Symbol(int index,
 int tag,
 String owner,
 String name,
 String value,
 long data)

Constructs a new Symbol. This constructor can't be used directly because the Symbol class is abstract. Instead, use the factory methods of the SymbolTable class.

参数:

index - the symbol index in the constant pool, in the BootstrapMethods attribute, or in the (ASM specific) type table of a class (depending on 'tag').

tag - the symbol type. Must be one of the static tag values defined in this class.

owner - The internal name of the symbol's owner class. Maybe null.

name - The name of the symbol's corresponding class field or method. Maybe null.

value - The string value of this symbol. Maybe null.

data - The numeric value of this symbol.

方法详细资料

getArgumentsAndReturnSizes

int getArgumentsAndReturnSizes()

Returns the result Type.getArgumentsAndReturnSizes() on value.

返回:

the result Type.getArgumentsAndReturnSizes() on value (memoized in info for efficiency). This should only be used for CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG and CONSTANT_INVOKE_DYNAMIC_TAG symbols.