Packages

  • package root
    Definition Classes
    root
  • package org
    Definition Classes
    root
  • package opalj

    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 - org.opalj.bi) that can be used to create arbitrary representations.
    • a library to create a one-to-one in-memory representation of Java bytecode (Bytecode Disassembler - org.opalj.da).
    • a library to convert this representation to Java class files (Bytecode Creator - org.opalj.bc).
    • a library to create a representation of Java bytecode that facilitates writing simple static analyses (Bytecode Representation - org.opalj.br).
    • a library to create a stackless, three-address code representation of Java bytecode that facilitates writing complex static analyses (Three Address Code - org.opalj.tac).
    • 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 (Dependencies Extraction - org.opalj.de) and to facilitate checking architecture definitions (Architecture Validation - org.opalj.av).
    • a library for the lightweight manipulation and creation of Java bytecode (Bytecode Assembler - org.opalj.ba).
    • a library for parsing Android packages (APK - org.opalj.apk).
    • libraries for writing static analyses using the interprocedural finite distributive subset (IFDS - org.opalj.ifds) and interprocedural distributive environment (IDE - org.opal.ide) algorithms.

    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.

    Implementation of an abstract interpretation (ai) framework.

    Please note that 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 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 cli
    Definition Classes
    ai
  • package common
    Definition Classes
    ai
  • package domain

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

    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
    • 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.

    Common utility functionality.

    Definition Classes
    ai
  • XHTML

package util

Common utility functionality.

Source
package.scala
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Value Members

  1. final def containsInPrefix(worklist: List[Int], pc: Int, prefixEnd: Int): Boolean

    Tests if the given pc is found in the (optional) prefix of the worklist where the end of the prefix is identified by prefixEnd.

    Tests if the given pc is found in the (optional) prefix of the worklist where the end of the prefix is identified by prefixEnd.

    If the worklist is empty, false is returned. If the given pc is equal to prefixEnd true will be returned.

    Annotations
    @inline() @tailrec()
  2. final def insertBefore(worklist: List[Int], pc: Int, prefixEnd: Int): List[Int]

    Inserts the given pc before prefixEnd in the list.

    Inserts the given pc before prefixEnd in the list. If the list does not contain prefixEnd, pc is appended to the list.

    Annotations
    @inline()
  3. final def insertBeforeIfNew(worklist: List[Int], pc: Int, prefixEnd: Int): List[Int]

    Inserts the given pc before prefixEnd in the list unless pc is already contained in the list.

    Inserts the given pc before prefixEnd in the list unless pc is already contained in the list. If the list does not contain prefixEnd, pc is appended to the list. If the list already contains pc the original list is returned!

    Annotations
    @inline()
  4. final def removeFirst(worklist: List[Int], pc: Int): List[Int]

    Removes the first occurrence of the specified pc from the list.

    Removes the first occurrence of the specified pc from the list. If the pc is not found, the original list is returned. I.e., it is possible to check whether the list is modified or not using a reference comparison (eq).

    Annotations
    @inline()
  5. final def removeFirstUnless(worklist: List[Int], pc: Int)(test: (Int) => Boolean): List[Int]

    Removes the first occurrence of the specified program counter from the given list unless the given test has failed.

    Removes the first occurrence of the specified program counter from the given list unless the given test has failed. If the test fails, the 'original list is returned. The given test is executed before the test is made whether we have to remove the element from the list. If the original list is returned it is possible to check whether the list is modified or not using a reference comparison (eq).

    Annotations
    @inline()
  6. object XHTML

    Several utility methods to facilitate the development of the abstract interpreter/ new domains for the abstract interpreter, by creating various kinds of dumps of the state of the interpreter.

    Several utility methods to facilitate the development of the abstract interpreter/ new domains for the abstract interpreter, by creating various kinds of dumps of the state of the interpreter.

    Thread Safety

    This object is thread-safe.

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