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  • package org
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    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) 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 br

    In this representation of Java bytecode references to a Java class file's constant pool and to attributes are replaced by direct references to the corresponding constant pool entries.

    In this representation of Java bytecode references to a Java class file's constant pool and to attributes are replaced by direct references to the corresponding constant pool entries. This facilitates developing analyses and fosters comprehension.

    Based on the fact that indirect references to constant pool entries are resolved and replaced by direct references this representation is called the resolved representation.

    This representation of Java bytecode is considered as OPAL's standard representation for writing Scala based analyses. This representation is engineered such that it facilitates writing analyses that use pattern matching.

    Definition Classes
    opalj
  • package cfg
    Definition Classes
    br
  • BasicBlock
  • CFG
  • CFGFactory
  • CFGNode
  • CatchNode
  • ExitNode
o

org.opalj.br.cfg

CFGFactory

object CFGFactory

A factory for computing control flow graphs for methods.

Source
CFGFactory.scala
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  4. def apply(implicit code: Code, classHierarchy: ClassHierarchy = ClassHierarchy.PreInitializedClassHierarchy): CFG[Instruction, Code]

    Constructs the control flow graph for a given method.

    Constructs the control flow graph for a given method.

    The constructed CFG basically consists of the code's basic blocks. Additionally, two artifical exit nodes are added. One artificial exit node is added to facilitate the navigation to all normal return instructions. A second artificial node is added that enables the navigation to all instructions that led to an abnormal return. Exception handlers are directly added to the graph using CatchNodes. Each exception handler is associated with exactly one CatchNode and all instructions that may throw a corresponding exception will have the respective CatchNode as a successor.

    code

    A method's body (i.e., the code.)

    classHierarchy

    The class hierarchy that will be used to determine if a certain exception is potentially handled by an exception handler.

    Note

    The algorithm supports all Java bytecode instructions - in particular JSR/RET.

    ,

    The code is parsed linearly and the graph is therefore constructed implicitly. Hence, it is possible that the graph contains nodes that cannot be reached from the start node.

  5. def apply(method: Method, classHierarchy: ClassHierarchy): Option[CFG[Instruction, Code]]
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