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Instruction_intbranch Class Reference

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

Public Methods
	Instruction_intbranch (byte c)
Instruction[]	branchpoints (Instruction next)
int	compile (byte bc[], int index)
int	nextOffset (int curr)
void	offsetToPointer (ByteCode bc)
int	parse (byte bc[], int index)
String	toString (cp_info constant_pool[])
Public Attributes
int	arg_i
Instruction	target

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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 142 of file Instruction_intbranch.java.

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Member Function Documentation

Instruction [] Instruction_intbranch::branchpoints (  Instruction   next )  [inline]

Returns an array of the instructions to which this instruction might branch (only valid if branches==true; default action is to return null). Parameters: next   the instruction following this one, in case of default flow through. Returns: array of instructions which may be targets of this instruction. See also: Instruction::branches Reimplemented from Instruction. Reimplemented in Instruction_Goto, and Instruction_Jsr. Definition at line 148 of file Instruction_intbranch.java.

int Instruction_intbranch::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. Definition at line 153 of file Instruction_intbranch.java.

int Instruction_intbranch::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. Definition at line 161 of file Instruction_intbranch.java.

void Instruction_intbranch::offsetToPointer (  ByteCode   bc )  [inline]

Changes offset values in this instruction to Instruction references; default behaviour is to do nothing. Parameters: bc   complete array of bytecode. See also: ByteCode::build Reimplemented from Instruction. Definition at line 162 of file Instruction_intbranch.java.

int Instruction_intbranch::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. Definition at line 170 of file Instruction_intbranch.java.

String Instruction_intbranch::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. Definition at line 174 of file Instruction_intbranch.java.

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

• Instruction_intbranch.java

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