dspl.intermediate.instructions
Class BranchInstruction

java.lang.Object
  dspl.intermediate.instructions.Instruction
      dspl.intermediate.instructions.BranchInstruction

Direct Known Subclasses:

PartialBranchInstruction

public class BranchInstruction
extends Instruction

Field Summary

Comparison	comp Contains the binary comparison which if true, the ifInstructions are evaluated, else, the elseInstructions are evaluated
Instruction	elseInst Instructions to be executed if hte "if" statement is not true (the else portion to be evaluated)
Instruction	ifInst Instructions to be executed if the "if" statement is true

Fields inherited from class dspl.intermediate.instructions.Instruction

INST_TYPE_ARITHMATIC, INST_TYPE_BRANCH, INST_TYPE_CCALL, INST_TYPE_FORLOOP, lastInstruction, nextInstruction, prevInstruction

Constructor Summary

BranchInstruction(Comparison comp, Instruction ifInst, Instruction elseInst)

Method Summary

int	getInstType()
boolean	usesVariable(Variable v) Designed to be a recursive call to see if a given variable is used anymore within a code block, after the current instruction.

Methods inherited from class dspl.intermediate.instructions.Instruction

setNextInstruction

Methods inherited from class java.lang.Object

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

Field Detail

comp

public Comparison comp

Contains the binary comparison which if true, the ifInstructions are evaluated, else, the elseInstructions are evaluated

ifInst

public Instruction ifInst

Instructions to be executed if the "if" statement is true

elseInst

public Instruction elseInst

Instructions to be executed if hte "if" statement is not true (the else portion to be evaluated)

Constructor Detail

BranchInstruction

public BranchInstruction(Comparison comp,
                         Instruction ifInst,
                         Instruction elseInst)

Method Detail

usesVariable

public boolean usesVariable(Variable v)

Description copied from class: Instruction

Designed to be a recursive call to see if a given variable is used anymore within a code block, after the current instruction. Intention is to allow a way to parse the Instruction tree to see if a specific variable is used again. NOTE: may not be necessary, or may need to be augmented to return a value indicating how far away from the current instruction will it be used again if desire to perform better register allocation.

Specified by:

usesVariable in class Instruction

Parameters:

v - the variable to search for to see if it is used

Returns:

getInstType

public int getInstType()

Specified by:

getInstType in class Instruction

Returns:

the instruction type of this instruction