Packages

  • package root
    Definition Classes
    root
  • package io
    Definition Classes
    root
  • package shiftleft
    Definition Classes
    io
  • package semanticcpg

    Domain specific language for querying code property graphs

    Domain specific language for querying code property graphs

    This is the API reference for the CPG query language, a language to mine code for defects and vulnerabilities both interactively on a code analysis shell (REPL), or using non-interactive scripts.

    Queries written in the CPG query language express graph traversals (see https://en.wikipedia.org/wiki/Graph_traversal). Similar to the standard graph traversal language "Gremlin" (see https://en.wikipedia.org/wiki/Gremlin_(programming_language))) these traversals are formulated as sequences of primitive language elements referred to as "steps". You can think of a step as a small program, similar to a unix shell utility, however, instead of processing lines one by one, the step processes nodes of the graph.

    Starting a traversal

    All traversals begin by selecting a set of start nodes, e.g.,

    cpg.method

    will start the traversal at all methods, while

    cpg.local

    will start at all local variables. The complete list of starting points can be found at 

    io.shiftleft.codepropertygraph.Cpg

    Lazy evaluation

    Queries are lazily evaluated, e.g., cpg.method creates a traversal which you can add more steps to. You can, for example, evaluate the traversal by converting it to a list:

    cpg.method.toList

    Since toList is such a common operation, we provide the shorthand l, meaning that

    cpg.method.l

    provides the same result as the former query.

    Properties

    Nodes have "properties", key-value pairs where keys are strings and values are primitive data types such as strings, integers, or Booleans. Properties of nodes can be selected based on their key, e.g.,

    cpg.method.name

    traverses to all method names. Nodes can also be filtered based on properties, e.g.,

    cpg.method.name(".*exec.*")

    traverse to all methods where name matches the regular expression ".*exec.*". You can see a complete list of properties by browsing to the API documentation of the corresponding step. For example, you can find the properties of method nodes at io.shiftleft.semanticcpg.language.types.structure.MethodTraversal.

    Side effects

    Useful if you want to mutate something outside the traversal, or simply debug it: This prints all typeDecl names as it traverses the graph and increments i for each one.

    var i = 0
cpg.typeDecl.sideEffect{typeTemplate => println(typeTemplate.name); i = i + 1}.exec

    [advanced] Selecting multiple things from your traversal

    If you are interested in multiple things along the way of your traversal, you label anything using the as modulator, and use select at the end. Note that the compiler automatically derived the correct return type as a tuple of the labelled steps, in this case with two elements.

    cpg.method.as("method").definingTypeDecl.as("classDef").select.toList
// return type: List[(Method, TypeDecl)]

    [advanced] For comprehensions

    You can always start a new traversal from a node, e.g.,

    val someMethod = cpg.method.head
someMethod.start.parameter.toList

    You can use this e.g. in a for comprehension, which is (in this context) essentially an alternative way to select multiple intermediate things. It is more expressive, but more computationally expensive.

    val query = for {
  method <- cpg.method
  param <- method.start.parameter
} yield (method.name, param.name)

query.toList
    Definition Classes
    shiftleft
  • package passes
    Definition Classes
    semanticcpg
  • package cfgcreation
    Definition Classes
    passes
  • package cfgdominator
    Definition Classes
    passes
  • package codepencegraph
    Definition Classes
    passes
  • package compat
    Definition Classes
    passes
  • package containsedges
    Definition Classes
    passes
  • package languagespecific
    Definition Classes
    passes
  • package linking
    Definition Classes
    passes
  • package metadata
    Definition Classes
    passes
  • package methoddecorations
    Definition Classes
    passes
  • package methodexternaldecorator
    Definition Classes
    passes
  • package namespacecreator
    Definition Classes
    passes
  • package receiveredges
    Definition Classes
    passes
  • ReceiverEdgePass
  • package trim
    Definition Classes
    passes
  • package typenodes
    Definition Classes
    passes

package receiveredges

Ordering
  1. Alphabetic
Visibility
  1. Public
  2. Protected

Type Members

  1. class ReceiverEdgePass extends CpgPass

    This pass only exists to assure backwards compatibility for java and c# cpgs which do not yet have the RECEIVER edge.

    This pass only exists to assure backwards compatibility for java and c# cpgs which do not yet have the RECEIVER edge. For those cases the RECEIVER edge is always between a CALL and a possibly existing instance argument and can thus easily be calculated here.

    This pass has no other pass as prerequisite.

    TODO remove once not needed anymore.

Value Members

  1. object ReceiverEdgePass

Ungrouped