org.apache.flex.abc.optimize

Class PeepholeOptimizerMethodBodyVisitor

java.lang.Object

org.apache.flex.abc.visitors.DelegatingMethodBodyVisitor

org.apache.flex.abc.optimize.PeepholeOptimizerMethodBodyVisitor

All Implemented Interfaces:

IMethodBodyVisitor, IVisitor

public class PeepholeOptimizerMethodBodyVisitor
extends DelegatingMethodBodyVisitor

IMethodBodyVisitor that will do peephole optimization of the method body. TODO: Not copmlete yet - should be equivalent to the peephole optimizer in MXMLC 4.5 Optimizations implemented: Eliminate unnecessary convert_d instructions Eliminate unnecessary convert_b instructions Eliminate unnecessary convert_i instructions Eliminate unnecessary convert_s instructions Eliminate unnecessary convert_u instructions Replace callprops where the return value is unused, with callpropvoid

Constructor Summary

Constructors

Constructor and Description
PeepholeOptimizerMethodBodyVisitor(IMethodBodyVisitor delegate)

Method Summary

Methods

Modifier and Type	Method and Description
void	labelCurrent(Label l) Bind a Label object (not to be confused with the AVM OP_label instruction) to the last-visited ABC instruction in this method.
void	labelNext(Label l) Bind a Label object (not to be confused with the AVM OP_label instruction) to the next ABC instruction that gets visited in this method
void	visitEnd() Indicates that no further method calls will be made on this visitor instance.
void	visitInstruction(Instruction instruction) Vist an instruction
void	visitInstruction(int opcode) Visit an instruction with no operands.
void	visitInstruction(int opcode, int immediate_operand) Visit an instruction with an immediate operand.
void	visitInstruction(int opcode, Object single_operand) Visit an instruction with a single operand (convenience method).
void	visitInstruction(int opcode, Object[] operands) Visit an instruction.
void	visitInstructionList(InstructionList new_list) Resets the entire method body at once.

Methods inherited from class org.apache.flex.abc.visitors.DelegatingMethodBodyVisitor

visit, visitException, visitTraits

Methods inherited from class java.lang.Object

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

Constructor Detail

PeepholeOptimizerMethodBodyVisitor

public PeepholeOptimizerMethodBodyVisitor(IMethodBodyVisitor delegate)

Method Detail

visitInstructionList

public void visitInstructionList(InstructionList new_list)

Resets the entire method body at once. The Peephole optimizer will process the entire instruction list, performing it's optimizations, before passing the InstructionList down to the next IMethodBodyVisitor. So any MethodBodyVisitors that the optimizer delegates to will receive a new InstructionList, with optimizations, instead of the InstructionList passed in.

Specified by:

visitInstructionList in interface IMethodBodyVisitor

Overrides:

visitInstructionList in class DelegatingMethodBodyVisitor

Parameters:

new_list - The new Instructions for the method.

visitInstruction

public void visitInstruction(int opcode)

Description copied from interface: IMethodBodyVisitor

Visit an instruction with no operands.

Specified by:

visitInstruction in interface IMethodBodyVisitor

Overrides:

visitInstruction in class DelegatingMethodBodyVisitor

Parameters:

opcode - - the instruction's opcode.

visitInstruction

public void visitInstruction(int opcode,
                    int immediate_operand)

Description copied from interface: IMethodBodyVisitor

Visit an instruction with an immediate operand.

Specified by:

visitInstruction in interface IMethodBodyVisitor

Overrides:

visitInstruction in class DelegatingMethodBodyVisitor

Parameters:

opcode - - the instruction's opcode.

immediate_operand - - the operand.

visitInstruction

public void visitInstruction(int opcode,
                    Object[] operands)

Description copied from interface: IMethodBodyVisitor

Visit an instruction.

Specified by:

visitInstruction in interface IMethodBodyVisitor

Overrides:

visitInstruction in class DelegatingMethodBodyVisitor

Parameters:

opcode - - the instruction's opcode.

operands - - the instruction's operands.

visitInstruction

public void visitInstruction(int opcode,
                    Object single_operand)

Description copied from interface: IMethodBodyVisitor

Visit an instruction with a single operand (convenience method).

Specified by:

visitInstruction in interface IMethodBodyVisitor

Overrides:

visitInstruction in class DelegatingMethodBodyVisitor

Parameters:

opcode - - the instruction's opcode.

single_operand - - the instruction's operand.

visitInstruction

public void visitInstruction(Instruction instruction)

Description copied from interface: IMethodBodyVisitor

Vist an instruction

Specified by:

visitInstruction in interface IMethodBodyVisitor

Overrides:

visitInstruction in class DelegatingMethodBodyVisitor

Parameters:

instruction - the Instruction to visit

visitEnd

public void visitEnd()

Description copied from interface: IVisitor

Indicates that no further method calls will be made on this visitor instance. Interfaces that derive from this interface add more specific meaning to this method.

Specified by:

visitEnd in interface IVisitor

Overrides:

visitEnd in class DelegatingMethodBodyVisitor

labelCurrent

public void labelCurrent(Label l)

Bind a Label object (not to be confused with the AVM OP_label instruction) to the last-visited ABC instruction in this method.

Specified by:

labelCurrent in interface IMethodBodyVisitor

Overrides:

labelCurrent in class DelegatingMethodBodyVisitor

labelNext

public void labelNext(Label l)

Bind a Label object (not to be confused with the AVM OP_label instruction) to the next ABC instruction that gets visited in this method

Specified by:

labelNext in interface IMethodBodyVisitor

Overrides:

labelNext in class DelegatingMethodBodyVisitor