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Instruction_byteindex Class Reference

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

Public Methods
	Instruction_byteindex (byte c)
int	compile (byte bc[], int index)
void	markCPRefs (boolean[] refs)
int	nextOffset (int curr)
int	parse (byte bc[], int index)
void	redirectCPRefs (short redirect[])
String	toString (cp_info constant_pool[])
Public Attributes
short	arg_b

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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 138 of file Instruction_byteindex.java.

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Member Function Documentation

int Instruction_byteindex::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 144 of file Instruction_byteindex.java.

void Instruction_byteindex::markCPRefs (  boolean   refs[] )  [inline]

Marks the appropriate spot if that constant_pool entry is used by this instr. For every constant pool entry used (referenced) by this instruction, the corresponding boolean in the given array is set to true. Parameters: refs   array of booleans the same size as the constant pool array. See also: ClassFile::constant_pool Reimplemented from Instruction. Definition at line 145 of file Instruction_byteindex.java.

int Instruction_byteindex::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 146 of file Instruction_byteindex.java.

int Instruction_byteindex::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 147 of file Instruction_byteindex.java.

void Instruction_byteindex::redirectCPRefs (  short   redirect[] )  [inline]

Updates all constant pool references within this instruction to use new indices, based on the given redirection array. Parameters: redirect   array of new indices of constant pool entries. See also: ClassFile::constant_pool Reimplemented from Instruction. Definition at line 154 of file Instruction_byteindex.java.

String Instruction_byteindex::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 155 of file Instruction_byteindex.java.

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Member Data Documentation

short Instruction_byteindex::arg_b

arg_b needs to be short in order to contain all the possible values for an unsigned byte Definition at line 142 of file Instruction_byteindex.java.

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

• Instruction_byteindex.java

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