Package proguard.classfile.attribute.visitor

Class StackSizeComputer

java.lang.Object

proguard.classfile.attribute.visitor.StackSizeComputer

All Implemented Interfaces:

AttributeVisitor

public class StackSizeComputer
extends Object
implements AttributeVisitor

This AttributeVisitor computes the stack sizes at all instruction offsets of the code attributes that it visits.

If only the maximum stack size is required, then prefer MaxStackSizeComputer since this class uses more memory because it stores the sizes for each offset.

Constructor Summary

Constructors

Constructor	Description
StackSizeComputer()	Construct a StackSizeComputer that keeps track of sizes at each offset.

Method Summary

Modifier and Type	Method	Description
int	getMaxStackSize()	Returns the maximum stack size of the most recently visited code attribute.
int	getStackSizeAfter(int instructionOffset)	Returns the stack size after the given instruction offset of the most recently visited code attribute.
int	getStackSizeBefore(int instructionOffset)	Returns the stack size before the given instruction offset 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	visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)

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

Constructor Details

StackSizeComputer

public StackSizeComputer()

Construct a StackSizeComputer that keeps track of sizes at each offset.

Method Details

isReachable

public boolean isReachable(int instructionOffset)

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

getStackSizeBefore

public int getStackSizeBefore(int instructionOffset)

Returns the stack size before the given instruction offset of the most recently visited code attribute.

getStackSizeAfter

public int getStackSizeAfter(int instructionOffset)

Returns the stack size after the given instruction offset of 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