Packages

Definition Classes: root

Definition Classes: root

OPAL is a Scala-based framework for the static analysis, manipulation and creation of Java bytecode.

OPAL is a Scala-based framework for the static analysis, manipulation and creation of Java bytecode. OPAL is designed with performance, scalability and adaptability in mind.

Its main components are:

a library (Common) which provides generally useful data-structures and algorithms for static analyses.
a framework for implementing lattice based static analyses (Static Analysis Infrastructure)
a framework for parsing Java bytecode (Bytecode Infrastructure) that can be used to create arbitrary representations.
a library to create a one-to-one in-memory representation of Java bytecode (Bytecode Disassembler).
a library to create a representation of Java bytecode that facilitates writing simple static analyses (Bytecode Representation - org.opalj.br).
a scalable, easily customizable framework for the abstract interpretation of Java bytecode (Abstract Interpretation Framework - org.opalj.ai).
a library to extract dependencies between code elements and to facilitate checking architecture definitions.
a library for the lightweight manipulation and creation of Java bytecode (Bytecode Assembler).

General Design Decisions

Thread Safety

Unless explicitly noted, OPAL is thread safe. I.e., the classes defined by OPAL can be considered to be thread safe unless otherwise stated. (For example, it is possible to read and process class files concurrently without explicit synchronization on the client side.)

No `null` Values

Unless explicitly noted, OPAL does not null values I.e., fields that are accessible will never contain null values and methods will never return null. If a method accepts null as a value for a parameter or returns a null value it is always explicitly documented. In general, the behavior of methods that are passed null values is undefined unless explicitly documented.

No Typecasts for Collections

For efficiency reasons, OPAL sometimes uses mutable data-structures internally. After construction time, these data-structures are generally represented using their generic interfaces (e.g., scala.collection.{Set,Map}). However, a downcast (e.g., to add/remove elements) is always forbidden as it would effectively prevent thread-safety.

Assertions

OPAL makes heavy use of Scala's Assertion Facility to facilitate writing correct code. Hence, for production builds (after thorough testing(!)) it is highly recommend to build OPAL again using -Xdisable-assertions.

Definition Classes: org

package ai

Implementation of an abstract interpretation (ai) framework – also referred to as OPAL.

Please note that OPAL/the abstract interpreter just refers to the classes and traits defined in this package (ai). The classes and traits defined in the sub-packages (in particular in domain) are not considered to be part of the core of OPAL/the abstract interpreter.

Definition Classes: opalj
Note: This framework assumes that the analyzed bytecode is valid; i.e., the JVM's bytecode verifier would be able to verify the code. Furthermore, load-time errors (e.g., LinkageErrors) are – by default – completely ignored to facilitate the analysis of parts of a project. In general, if the presented bytecode is not valid, the result is undefined (i.e., OPAL may report meaningless results, crash or run indefinitely).
See also: org.opalj.ai.AI - Implements the abstract interpreter that processes a methods code and uses an analysis-specific domain to perform the abstract computations.
org.opalj.ai.Domain - The core interface between the abstract interpretation framework and the abstract domain that is responsible for performing the abstract computations.

package common

Definition Classes: ai

package domain

This package contains definitions of common domains that can be used for the implementation of analyses.

Types of Domains

In general, we distinguish two types of domains. First, domains that define a general interface (on top of the one defined by Domain), but do not directly provide an implementation. Hence, whenever you develop a new Domain you should consider implementing/using these domains to maximize reusability. Second, Domains that implement a specific interface (trait). In this case, we further distinguish between domains that provide a default implementation (per interface only one of these Domains can be used to create a final Domain) and those that can be stacked and basically refine the overall functionality.

Examples

Domains That Define a General Interface
- Origin defines two types which domains that provide information abou the origin of a value should consider to implement.
- TheProject defines a standard mechanism how a domain can access the current project.
- ...
Domains That Provide a Default Implementation
- Origin defines the functionality to return a value's origin if the value supports that.
- org.opalj.ai.domain.TheProject default implementation of the class hierarchy related methods using the project's class hierarchy.
- org.opalj.ai.domain.DefaultHandlingOfMethodResults basically implements a Domain's methods related to return instructions an uncaught exceptions.
- ...
Domains That Implement Stackable Functionality
- org.opalj.ai.domain.RecordThrownExceptions records information about all uncaught exceptions by intercepting a Domain's respective methods. However, it does provide a default implementation. Hence, a typical pattern is:

class MyDomain extends Domain with ...
    with DefaultHandlingOfMethodResults with RecordThrownExceptions

Thread Safety

Unless explicitly documented, a domain is never thread-safe. The general programming model is to use one Domain object per code block/method and therefore, thread-safety is not required for Domains that are used for the evaluation of methods. However domains that are used to adapt/transfer values should be thread safe (see org.opalj.ai.domain.ValuesCoordinatingDomain for further details).

Definition Classes: ai

package fpcf

Definition Classes: ai

package project

Definition Classes: ai

package util

Common utility functionality.

Definition Classes: ai

BoundedInterruptableAI

ComputationWithException

ComputationWithResult

ComputationWithResultAndException

ComputationWithSideEffectOnly

ComputationWithSideEffectOrException

ComputedValue

ComputedValueOrException

Configuration

CoreDomainFunctionality

CorrelationalDomain

CorrelationalDomainSupport

ExceptionsRaisedByCalledMethods

FieldAccessesDomain

FloatValuesDomain

FloatValuesFactory

GlobalLogContextProvider

IdentityBasedCorrelationChangeDetection

InstructionCountBoundedAI

IntegerRangeValuesFactory

IntegerValuesDomain

IntegerValuesFactory

InterpretationFailedException

MetaInformationUpdate

MetaInformationUpdateType

MethodCallsDomain

MonitorInstructionsDomain

MultiTracer

NoUpdate

NoUpdateType

PrimitiveValuesConversionsDomain

ReferenceValuesDomain

ReferenceValuesFactory

ReturnInstructionsDomain

MetaInformationUpdate

final case class MetaInformationUpdate[V](value: V) extends SomeUpdate[V] with Product with Serializable

Characterizes an update that did not affect the abstract state but instead just updated some meta information.

In general, the abstract interpretation framework handles NoUpdates and MetaInformationUpdates in the same way.

Example

If two values are merged that are seen on two different paths, but which represent the same abstract value, we may want to update the meta-information about the origin of the current value, but this information may not be part of the abstract state and hence, is not relevant for the abstract interpreter. In this case the interpreter will not reschedule subsequent instructions. However, whether or not the information about the origin of a value is considered to be part of the abstract state is a decision of the domain.

Source: Update.scala

Linear Supertypes

Serializable, Product, Equals, SomeUpdate[V], Update[V], AnyRef, Any

Ordering

Alphabetic
By Inheritance

Inherited

MetaInformationUpdate
Serializable
Product
Equals
SomeUpdate
Update
AnyRef
Any

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Visibility

Public
Protected

Instance Constructors

new MetaInformationUpdate(value: V)

Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
def &:(updateType: UpdateType): UpdateType
Merges a given updateType value with the type of this update and returns a new UpdateType value.
Merges a given updateType value with the type of this update and returns a new UpdateType value.
Definition Classes
MetaInformationUpdate → Update
See also
org.opalj.ai.UpdateType for further details.
final def ==(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0
Definition Classes
Any
def clone(): AnyRef
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native() @IntrinsicCandidate()
final def eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native() @IntrinsicCandidate()
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
def isMetaInformationUpdate: Boolean
Definition Classes
MetaInformationUpdate → Update
def isNoUpdate: Boolean
Definition Classes
SomeUpdate → Update
def isSomeUpdate: Boolean
Definition Classes
SomeUpdate → Update
def isStructuralUpdate: Boolean
Definition Classes
Update
final def ne(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def notify(): Unit
Definition Classes
AnyRef
Annotations
@native() @IntrinsicCandidate()
final def notifyAll(): Unit
Definition Classes
AnyRef
Annotations
@native() @IntrinsicCandidate()
def productElementNames: Iterator[String]
Definition Classes
Product
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
def updateType: UpdateType
The type of this update.
The type of this update.
Definition Classes
MetaInformationUpdate → Update
def updateValue[NewV](newValue: NewV): MetaInformationUpdate[NewV]
Creates a new Update object of the same type with the given value.
Creates a new Update object of the same type with the given value.
Definition Classes
MetaInformationUpdate → Update
val value: V
The updated value; if available.
The updated value; if available.
Definition Classes
MetaInformationUpdate → Update
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

def finalize(): Unit
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable]) @Deprecated
Deprecated

Packages

General Design Decisions

Thread Safety

No `null` Values

No Typecasts for Collections

Assertions

Types of Domains

Thread Safety

MetaInformationUpdate

final case class MetaInformationUpdate[V](value: V) extends SomeUpdate[V] with Product with Serializable

Example

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from SomeUpdate[V]

Inherited from Update[V]

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

General Design Decisions

Thread Safety

No null Values

No Typecasts for Collections

Assertions

Types of Domains

Thread Safety

MetaInformationUpdate

final case class MetaInformationUpdate[V](value: V) extends SomeUpdate[V] with Product with Serializable

Example

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from SomeUpdate[V]

Inherited from Update[V]

Inherited from AnyRef

Inherited from Any

Ungrouped

No `null` Values

MetaInformationUpdate