Package proguard.classfile.attribute.visitor

Class MaxStackSizeComputer

java.lang.Object

proguard.classfile.attribute.visitor.MaxStackSizeComputer

All Implemented Interfaces:

AttributeVisitor, ExceptionInfoVisitor, InstructionVisitor

public class MaxStackSizeComputer
extends java.lang.Object
implements AttributeVisitor, InstructionVisitor, ExceptionInfoVisitor

This AttributeVisitor computes the maximum stack size of the code attributes that it visits.

This is a more memory efficient version of StackSizeComputer that doesn't store the stack sizes for every offset.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	MaxStackSizeComputer.StackSizeConsumer	A consumer of before/after stack sizes at each offset evaluated by the MaxStackSizeComputer.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean[]	evaluated
static int	prettyInstructionBuffered

Constructor Summary

Constructors

Constructor	Description
MaxStackSizeComputer()
MaxStackSizeComputer(MaxStackSizeComputer.StackSizeConsumer stackSizeConsumer)

Method Summary

Modifier and Type	Method	Description
int	getMaxStackSize()	Returns the maximum stack size of the most recently visited code attribute.
boolean	isReachable(int instructionOffset)	Returns whether the instruction at the given offset is reachable in the most recently visited code attribute.
void	visitAnyAttribute(Clazz clazz, Attribute attribute)	Visits any Attribute instance.
void	visitAnySwitchInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, SwitchInstruction switchInstruction)	Visits any SwitchInstruction instance.
void	visitBranchInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, BranchInstruction branchInstruction)
void	visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
void	visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
void	visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
void	visitSimpleInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, SimpleInstruction simpleInstruction)
void	visitVariableInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VariableInstruction variableInstruction)

Methods inherited from class java.lang.Object

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

Methods inherited from interface proguard.classfile.attribute.visitor.AttributeVisitor

visitAnnotationDefaultAttribute, visitAnyAnnotationsAttribute, visitAnyParameterAnnotationsAttribute, visitAnyTypeAnnotationsAttribute, visitBootstrapMethodsAttribute, visitConstantValueAttribute, visitDeprecatedAttribute, visitDeprecatedAttribute, visitDeprecatedAttribute, visitDeprecatedAttribute, visitEnclosingMethodAttribute, visitExceptionsAttribute, visitInnerClassesAttribute, visitLineNumberTableAttribute, visitLocalVariableTableAttribute, visitLocalVariableTypeTableAttribute, visitMethodParametersAttribute, visitModuleAttribute, visitModuleMainClassAttribute, visitModulePackagesAttribute, visitNestHostAttribute, visitNestMembersAttribute, visitPermittedSubclassesAttribute, visitRecordAttribute, visitRuntimeInvisibleAnnotationsAttribute, visitRuntimeInvisibleAnnotationsAttribute, visitRuntimeInvisibleAnnotationsAttribute, visitRuntimeInvisibleAnnotationsAttribute, visitRuntimeInvisibleAnnotationsAttribute, visitRuntimeInvisibleParameterAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeInvisibleTypeAnnotationsAttribute, visitRuntimeVisibleAnnotationsAttribute, visitRuntimeVisibleAnnotationsAttribute, visitRuntimeVisibleAnnotationsAttribute, visitRuntimeVisibleAnnotationsAttribute, visitRuntimeVisibleAnnotationsAttribute, visitRuntimeVisibleParameterAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitRuntimeVisibleTypeAnnotationsAttribute, visitSignatureAttribute, visitSignatureAttribute, visitSignatureAttribute, visitSignatureAttribute, visitSignatureAttribute, visitSourceDebugExtensionAttribute, visitSourceDirAttribute, visitSourceFileAttribute, visitStackMapAttribute, visitStackMapTableAttribute, visitSyntheticAttribute, visitSyntheticAttribute, visitSyntheticAttribute, visitSyntheticAttribute, visitUnknownAttribute

Methods inherited from interface proguard.classfile.instruction.visitor.InstructionVisitor

visitAnyInstruction, visitLookUpSwitchInstruction, visitTableSwitchInstruction

Field Detail

prettyInstructionBuffered

public static int prettyInstructionBuffered

evaluated

protected boolean[] evaluated

Constructor Detail

MaxStackSizeComputer

public MaxStackSizeComputer()

MaxStackSizeComputer

public MaxStackSizeComputer(MaxStackSizeComputer.StackSizeConsumer stackSizeConsumer)

Method Detail

isReachable

public boolean isReachable(int instructionOffset)

Returns whether the instruction at the given offset is reachable in the most recently visited code attribute.

getMaxStackSize

public int getMaxStackSize()

Returns the maximum stack size of the most recently visited code attribute.

visitAnyAttribute

public void visitAnyAttribute(Clazz clazz,
                              Attribute attribute)

Description copied from interface: AttributeVisitor

Visits any Attribute instance. The more specific default implementations of this interface delegate to this method.

Specified by:

visitAnyAttribute in interface AttributeVisitor

visitCodeAttribute

public void visitCodeAttribute(Clazz clazz,
                               Method method,
                               CodeAttribute codeAttribute)

Specified by:

visitCodeAttribute in interface AttributeVisitor

visitSimpleInstruction

public void visitSimpleInstruction(Clazz clazz,
                                   Method method,
                                   CodeAttribute codeAttribute,
                                   int offset,
                                   SimpleInstruction simpleInstruction)

Specified by:

visitSimpleInstruction in interface InstructionVisitor

visitConstantInstruction

public void visitConstantInstruction(Clazz clazz,
                                     Method method,
                                     CodeAttribute codeAttribute,
                                     int offset,
                                     ConstantInstruction constantInstruction)

Specified by:

visitConstantInstruction in interface InstructionVisitor

visitVariableInstruction

public void visitVariableInstruction(Clazz clazz,
                                     Method method,
                                     CodeAttribute codeAttribute,
                                     int offset,
                                     VariableInstruction variableInstruction)

Specified by:

visitVariableInstruction in interface InstructionVisitor

visitBranchInstruction

public void visitBranchInstruction(Clazz clazz,
                                   Method method,
                                   CodeAttribute codeAttribute,
                                   int offset,
                                   BranchInstruction branchInstruction)

Specified by:

visitBranchInstruction in interface InstructionVisitor

visitAnySwitchInstruction

public void visitAnySwitchInstruction(Clazz clazz,
                                      Method method,
                                      CodeAttribute codeAttribute,
                                      int offset,
                                      SwitchInstruction switchInstruction)

Description copied from interface: InstructionVisitor

Visits any SwitchInstruction instance. The more specific default implementations of this interface delegate to this method.

Specified by:

visitAnySwitchInstruction in interface InstructionVisitor

visitExceptionInfo

public void visitExceptionInfo(Clazz clazz,
                               Method method,
                               CodeAttribute codeAttribute,
                               ExceptionInfo exceptionInfo)

Specified by:

visitExceptionInfo in interface ExceptionInfoVisitor