com.alibaba.fastjson2.internal.asm

Class SymbolTable

java.lang.Object

com.alibaba.fastjson2.internal.asm.SymbolTable

final class SymbolTable
extends java.lang.Object

The constant pool entries, the BootstrapMethods attribute entries and the (ASM specific) type table entries of a class.

See Also:

JVMS 4.4, JVMS 4.7.23

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.lang.String	className The internal name of the class to which this symbol table belongs.
(package private) ClassWriter	classWriter
(package private) ByteVector	constantPool The content of the ClassFile's constant_pool JVMS structure corresponding to this SymbolTable.
(package private) int	constantPoolCount The number of constant pool items in constantPool, plus 1.
private Symbol[]	entries
private int	entryCount
private int	typeCount The actual number of elements in typeTable.
(package private) Symbol[]	typeTable

Constructor Summary

Constructors

Constructor and Description
SymbolTable(ClassWriter classWriter) Constructs a new, empty SymbolTable for the given ClassWriter.

Method Summary

Modifier and Type	Method and Description
(package private) Symbol	addConstantIntegerOrFloat(int value)
(package private) Symbol	addConstantLongOrDouble(long value)
(package private) Symbol	addConstantMemberReference(int tag, java.lang.String owner, java.lang.String name, java.lang.String descriptor)
(package private) int	addConstantNameAndType(java.lang.String name, java.lang.String descriptor) Adds a CONSTANT_NameAndType_info to the constant pool of this symbol table.
(package private) int	addConstantUtf8(java.lang.String value) Adds a CONSTANT_Utf8_info to the constant pool of this symbol table.
(package private) Symbol	addConstantUtf8Reference(int tag, java.lang.String value)
(package private) int	addMergedType(int typeTableIndex1, int typeTableIndex2)
(package private) int	addType(java.lang.String value) Adds a type in the type table of this symbol table.
private int	addTypeInternal(Symbol entry)
(package private) int	addUninitializedType(java.lang.String value, int bytecodeOffset) Adds an Frame.ITEM_UNINITIALIZED type in the type table of this symbol table.
private Symbol	put(Symbol entry) Puts the given entry in the entries hash set.
(package private) int	setMajorVersionAndClassName(int majorVersion, java.lang.String className) Sets the major version and the name of the class to which this symbol table belongs.

Methods inherited from class java.lang.Object

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

Field Detail

classWriter

final ClassWriter classWriter

className

java.lang.String className

The internal name of the class to which this symbol table belongs.

entryCount

private int entryCount

entries

private Symbol[] entries

constantPoolCount

int constantPoolCount

The number of constant pool items in constantPool, plus 1. The first constant pool item has index 1, and long and double items count for two items.

constantPool

final ByteVector constantPool

The content of the ClassFile's constant_pool JVMS structure corresponding to this SymbolTable. The ClassFile's constant_pool_count field is not included.

typeCount

private int typeCount

The actual number of elements in typeTable. These elements are stored from index 0 to typeCount (excluded). The other array entries are empty.

typeTable

Symbol[] typeTable

Constructor Detail

SymbolTable

SymbolTable(ClassWriter classWriter)

Constructs a new, empty SymbolTable for the given ClassWriter.

Parameters:

classWriter - a ClassWriter.

Method Detail

setMajorVersionAndClassName

int setMajorVersionAndClassName(int majorVersion,
                                java.lang.String className)

Sets the major version and the name of the class to which this symbol table belongs. Also adds the class name to the constant pool.

Parameters:

majorVersion - a major ClassFile version number.

className - an internal class name.

Returns:

the constant pool index of a new or already existing Symbol with the given class name.

put

private Symbol put(Symbol entry)

Puts the given entry in the entries hash set. This method does not check whether entries already contains a similar entry or not. entries is resized if necessary to avoid hash collisions (multiple entries needing to be stored at the same entries array index) as much as possible, with reasonable memory usage.

Parameters:

entry - an Entry (which must not already be contained in entries).

Returns:

the given entry

addConstantMemberReference

Symbol addConstantMemberReference(int tag,
                                  java.lang.String owner,
                                  java.lang.String name,
                                  java.lang.String descriptor)

addConstantIntegerOrFloat

Symbol addConstantIntegerOrFloat(int value)

addConstantLongOrDouble

Symbol addConstantLongOrDouble(long value)

addConstantNameAndType

int addConstantNameAndType(java.lang.String name,
                           java.lang.String descriptor)

Adds a CONSTANT_NameAndType_info to the constant pool of this symbol table. Does nothing if the constant pool already contains a similar item.

Parameters:

name - a field or method name.

descriptor - a field or method descriptor.

Returns:

a new or already existing Symbol with the given value.

addConstantUtf8

int addConstantUtf8(java.lang.String value)

Adds a CONSTANT_Utf8_info to the constant pool of this symbol table. Does nothing if the constant pool already contains a similar item.

Parameters:

value - a string.

Returns:

a new or already existing Symbol with the given value.

addConstantUtf8Reference

Symbol addConstantUtf8Reference(int tag,
                                java.lang.String value)

addType

int addType(java.lang.String value)

Adds a type in the type table of this symbol table. Does nothing if the type table already contains a similar type.

Parameters:

value - an internal class name.

Returns:

the index of a new or already existing type Symbol with the given value.

addUninitializedType

int addUninitializedType(java.lang.String value,
                         int bytecodeOffset)

Adds an Frame.ITEM_UNINITIALIZED type in the type table of this symbol table. Does nothing if the type table already contains a similar type.

Parameters:

value - an internal class name.

bytecodeOffset - the bytecode offset of the NEW instruction that created this Frame.ITEM_UNINITIALIZED type value.

Returns:

the index of a new or already existing type Symbol with the given value.

addMergedType

int addMergedType(int typeTableIndex1,
                  int typeTableIndex2)

addTypeInternal

private int addTypeInternal(Symbol entry)