Package proguard.evaluation.executor

Class ReflectionExecutor

java.lang.Object

proguard.evaluation.executor.ReflectionExecutor

All Implemented Interfaces:

Executor

Direct Known Subclasses:

StringReflectionExecutor

public abstract class ReflectionExecutor
extends java.lang.Object
implements Executor

This Executor provides an implementation for Executor.getMethodResult(proguard.evaluation.executor.MethodExecutionInfo, proguard.evaluation.ValueCalculator) which tries to resolve the method at runtime and execute it using Java's reflection API java.lang.reflect.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ReflectionExecutor.InstanceCopyResult

Nested classes/interfaces inherited from interface proguard.evaluation.executor.Executor

Executor.Builder<T extends Executor>

Constructor Summary

Constructors

Constructor	Description
ReflectionExecutor()

Method Summary

Modifier and Type	Method	Description
protected abstract ExecutorInstanceHandler	getDefaultInstanceHandler()	Provides a default instance handler used by the executor in case the reflective execution fails.
protected abstract java.util.Optional<ReflectionExecutor.InstanceCopyResult>	getInstanceOrCopyIfMutable(ReferenceValue instanceValue)	Get an object which will act as the calling instance.
MethodResult	getMethodResult(MethodExecutionInfo methodExecutionInfo, ValueCalculator valueCalculator)	Calculate the result of a given method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface proguard.evaluation.executor.Executor

getSupportedMethodSignatures

Constructor Detail

ReflectionExecutor

public ReflectionExecutor()

Method Detail

getMethodResult

public MethodResult getMethodResult(MethodExecutionInfo methodExecutionInfo,
                                    ValueCalculator valueCalculator)

Description copied from interface: Executor

Calculate the result of a given method. This is the return value for a non-constructor method (null if it returns void) and the instantiated object for a constructor.

Specified by:

getMethodResult in interface Executor

Parameters:

methodExecutionInfo - Information about the called method.

valueCalculator - a function mapping the result of a method invocation (can be an Object with the result if the executor calculates a real value or a Model) to the appropriate Value used by the analysis. Should also be used to create values of unknown value since the executor might be able to provide additional information on them even if the value itself is not known (e.g., on the identifier of the returned value).

Returns:

The result of the method call, including information on the returned value or values or arguments on which side effects happened during the method execution. If the executor is not able to provide any additional information for any reason the returned value should be MethodResult.invalidResult(), so that the caller can know that execution failed and just provide its best approximation of the result.

getInstanceOrCopyIfMutable

protected abstract java.util.Optional<ReflectionExecutor.InstanceCopyResult> getInstanceOrCopyIfMutable(ReferenceValue instanceValue)

Get an object which will act as the calling instance. If we know that executing the method does not modify the instance this can just be the same value. Otherwise, a copy should be returned in order to not change the reference whose state may be of interest at the end of an analysis.

Parameters:

instanceValue - The ReferenceValue of the instance.

Returns:

The new calling instance.

getDefaultInstanceHandler

protected abstract ExecutorInstanceHandler getDefaultInstanceHandler()

Provides a default instance handler used by the executor in case the reflective execution fails.

The handler carries information on whether a method returns the same object as its instance.

Returns:

the default instance handler.