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Instruction_bytevar Class Reference

Inheritance diagram for Instruction_bytevar:[legend]Collaboration diagram for Instruction_bytevar:[legend]List of all members.

Public Methods
	Instruction_bytevar (byte c)
int	compile (byte bc[], int index)
int	nextOffset (int curr)
int	parse (byte bc[], int index)
String	toString (cp_info constant_pool[])
Public Attributes
int	arg_b
boolean	isWide

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Detailed Description

Instruction subclasses are used to represent parsed bytecode; each bytecode operation has a corresponding subclass of Instruction.

Each subclass is derived from one of

• Instruction
• Instruction_noargs (an Instruction with no embedded arguments)
• Instruction_byte (an Instruction with a single byte data argument)
• Instruction_bytevar (a byte argument specifying a local variable)
• Instruction_byteindex (a byte argument specifying a constant pool index)
• Instruction_int (an Instruction with a single short data argument)
• Instruction_intvar (a short argument specifying a local variable)
• Instruction_intindex (a short argument specifying a constant pool index)
• Instruction_intbranch (a short argument specifying a code offset)
• Instruction_longbranch (an int argument specifying a code offset)

Author:

Clark Verbrugge

See also:

Instruction , Instruction_noargs , Instruction_byte , Instruction_bytevar , Instruction_byteindex , Instruction_int , Instruction_intvar , Instruction_intindex , Instruction_intbranch , Instruction_longbranch , Instruction_Unknown

Definition at line 141 of file Instruction_bytevar.java.

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Member Function Documentation

int Instruction_bytevar::compile (  byte   bc[], int   index )  [inline, virtual]

Writes out the sequence of bytecodes represented by this instruction, including any arguments. Parameters: bc   complete array of bytecode. index   offset of remaining bytecode at which to start writing. Returns: offset of the next available bytecode. See also: ClassFile::unparseMethod , Instruction::parse Reimplemented from Instruction. Reimplemented in Instruction_Iinc. Definition at line 149 of file Instruction_bytevar.java.

int Instruction_bytevar::nextOffset (  int   curr )  [inline]

Returns the next available offset assuming this instruction begins on the indicated offset; default assumes no arguments. Parameters: curr   offset this instruction would be on. Returns: next available offset. See also: ClassFile::relabel Reimplemented from Instruction. Reimplemented in Instruction_Iinc. Definition at line 150 of file Instruction_bytevar.java.

int Instruction_bytevar::parse (  byte   bc[], int   index )  [inline, virtual]

Assuming the actual bytecode for this instruction has been extracted already, and index is the offset of the next byte, this method parses whatever arguments the instruction requires and return the offset of the next available byte. Parameters: bc   complete array of bytecode. index   offset of remaining bytecode after this instruction's bytecode was parsed. Returns: offset of the next available bytecode. See also: ByteCode::disassemble_bytecode , Instruction::compile Reimplemented from Instruction. Reimplemented in Instruction_Iinc. Definition at line 151 of file Instruction_bytevar.java.

String Instruction_bytevar::toString (  cp_info   constant_pool[] )  [inline]

For displaying instructions. Parameters: constant_pool   constant pool of associated ClassFile Returns: String representation of this instruction. Reimplemented from Instruction. Reimplemented in Instruction_Iinc. Definition at line 169 of file Instruction_bytevar.java.

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Member Data Documentation

int Instruction_bytevar::arg_b

arg_b needs to be short in order to contain all the possible values for an unsigned byte Definition at line 145 of file Instruction_bytevar.java.

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The documentation for this class was generated from the following file:

• Instruction_bytevar.java

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