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semanticcpg apidocs/io.joern.x2cpg/io.joern.x2cpg.passes/io.joern.x2cpg.passes.frontend

io.joern.x2cpg.passes.frontend

package io.joern.x2cpg.passes.frontend

Members list

Type members

Classlikes

case class CDereference() extends Dereference

Attributes

Supertypes
trait Serializable
trait Product
trait Equals
trait Dereference
class Object
trait Matchable
class Any
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case class CallAlias(identifier: String, receiverName: Option[String]) extends LocalKey

A name that refers to some kind of callee.

A name that refers to some kind of callee.

Attributes

Supertypes
trait Serializable
trait Product
trait Equals
class LocalKey
class SBKey
class Object
trait Matchable
class Any
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case class CollectionVar(identifier: String, idx: String) extends LocalKey

A collection object that can be accessed with potentially dynamic keys and values.

A collection object that can be accessed with potentially dynamic keys and values.

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Supertypes
trait Serializable
trait Product
trait Equals
class LocalKey
class SBKey
class Object
trait Matchable
class Any
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case class DefaultDereference() extends Dereference

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trait Serializable
trait Product
trait Equals
trait Dereference
class Object
trait Matchable
class Any
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object Dereference

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Companion
trait
Supertypes
trait Sum
trait Mirror
class Object
trait Matchable
class Any
Self type
sealed trait Dereference

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Companion
object
Supertypes
class Object
trait Matchable
class Any
Known subtypes
class CDereference
object ImportStringHandling

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class Object
trait Matchable
class Any
Self type
sealed class LocalKey(identifier: String) extends SBKey

Represents an identifier of some AST node at an intraprocedural scope.

Represents an identifier of some AST node at an intraprocedural scope.

Attributes

Supertypes
class SBKey
class Object
trait Matchable
class Any
Known subtypes
class CallAlias
class LocalVar
case class LocalVar(identifier: String) extends LocalKey

A variable that holds data within an intraprocedural scope.

A variable that holds data within an intraprocedural scope.

Attributes

Supertypes
trait Serializable
trait Product
trait Equals
class LocalKey
class SBKey
class Object
trait Matchable
class Any
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class MetaDataPass(cpg: Cpg, language: String, root: String) extends CpgPass

A pass that creates a MetaData node, specifying that this is a CPG for language, and a NamespaceBlock for anything that cannot be assigned to any other namespace.

A pass that creates a MetaData node, specifying that this is a CPG for language, and a NamespaceBlock for anything that cannot be assigned to any other namespace.

Attributes

Companion
object
Supertypes
class CpgPass
class ForkJoinParallelCpgPass[AnyRef]
class NewStyleCpgPassBase[AnyRef]
trait CpgPassBase
class Object
trait Matchable
class Any
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object MetaDataPass

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Companion
class
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class Object
trait Matchable
class Any
Self type
abstract class RecoverForXCompilationUnit[CompilationUnitType <: AstNode](cpg: Cpg, cu: CompilationUnitType, builder: DiffGraphBuilder, state: XTypeRecoveryState) extends Runnable

Performs type recovery from the root of a compilation unit level

Performs type recovery from the root of a compilation unit level

Type parameters

CompilationUnitType

the AstNode type used to represent a compilation unit of the language.

Value parameters

builder

the graph builder

cpg

the graph.

cu

a compilation unit, e.g. file, procedure, type, etc.

Attributes

Supertypes
trait Runnable
class Object
trait Matchable
class Any
abstract class SBKey(val identifier: String)

Represents an identifier of some AST node at a specific scope.

Represents an identifier of some AST node at a specific scope.

Attributes

Companion
object
Supertypes
class Object
trait Matchable
class Any
Known subtypes
class LocalKey
class CallAlias
class LocalVar
object SBKey

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Companion
class
Supertypes
class Object
trait Matchable
class Any
Self type
SBKey.type
class SymbolTable[K <: SBKey](val keyFromNode: AstNode => Option[K])

A thread-safe symbol table that can represent multiple types per symbol. Each node in an AST gets converted to an SBKey which gives contextual information to identify an AST entity. Each value in this table represents a set of types that the key could be in a flow-insensitive manner.

A thread-safe symbol table that can represent multiple types per symbol. Each node in an AST gets converted to an SBKey which gives contextual information to identify an AST entity. Each value in this table represents a set of types that the key could be in a flow-insensitive manner.

The SymbolTable operates like a map with a few convenient methods that are designed for this structure's purpose.

Attributes

Supertypes
class Object
trait Matchable
class Any
class TypeNodePass extends CpgPass

Creates a TYPE node for each type in usedTypes as well as all inheritsFrom type names in the CPG

Creates a TYPE node for each type in usedTypes as well as all inheritsFrom type names in the CPG

Alternatively, set getTypesFromCpg = true. If this is set, the registeredTypes argument will be ignored. Instead, type nodes will be created for every unique TYPE_FULL_NAME value in the CPG.

Attributes

Companion
object
Supertypes
class CpgPass
class ForkJoinParallelCpgPass[AnyRef]
class NewStyleCpgPassBase[AnyRef]
trait CpgPassBase
class Object
trait Matchable
class Any
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object TypeNodePass

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Companion
class
Supertypes
class Object
trait Matchable
class Any
Self type
trait TypeRecoveryParserConfig[R <: X2CpgConfig[R]]

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Supertypes
class Object
trait Matchable
class Any
Self type
R
abstract class XConfigFileCreationPass(cpg: Cpg) extends ConcurrentWriterCpgPass[File]

Scans for and inserts configuration files into the CPG. Relies on the MetaData's ROOT property to provide the path to scan.

Scans for and inserts configuration files into the CPG. Relies on the MetaData's ROOT property to provide the path to scan.

Attributes

Supertypes
class ConcurrentWriterCpgPass[File]
class NewStyleCpgPassBase[File]
trait CpgPassBase
class Object
trait Matchable
class Any
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abstract class XImportResolverPass(cpg: Cpg) extends ConcurrentWriterCpgPass[Import]

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Supertypes
class ConcurrentWriterCpgPass[Import]
class NewStyleCpgPassBase[Import]
trait CpgPassBase
class Object
trait Matchable
class Any
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abstract class XImportsPass(cpg: Cpg) extends ConcurrentWriterCpgPass[(Call, Assignment)]

Attributes

Supertypes
class ConcurrentWriterCpgPass[(Call, Assignment)]
class NewStyleCpgPassBase[(Call, Assignment)]
trait CpgPassBase
class Object
trait Matchable
class Any
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abstract class XInheritanceFullNamePass(cpg: Cpg) extends ForkJoinParallelCpgPass[TypeDecl]

Using some basic heuristics, will try to resolve type full names from types found within the CPG. Requires ImportPass as a pre-requisite.

Using some basic heuristics, will try to resolve type full names from types found within the CPG. Requires ImportPass as a pre-requisite.

Attributes

Supertypes
class ForkJoinParallelCpgPass[TypeDecl]
class NewStyleCpgPassBase[TypeDecl]
trait CpgPassBase
class Object
trait Matchable
class Any
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abstract class XTypeHintCallLinker(cpg: Cpg) extends CpgPass

Attempts to set the methodFullName and link to callees using the recovered type information from XTypeRecovery. Note that some methods may not be present as they could be external and have been dynamically discovered, thus the io.joern.x2cpg.passes.base.MethodStubCreator would have missed it.

Attempts to set the methodFullName and link to callees using the recovered type information from XTypeRecovery. Note that some methods may not be present as they could be external and have been dynamically discovered, thus the io.joern.x2cpg.passes.base.MethodStubCreator would have missed it.

Value parameters

cpg

the target code property graph.

Attributes

Companion
object
Supertypes
class CpgPass
class ForkJoinParallelCpgPass[AnyRef]
class NewStyleCpgPassBase[AnyRef]
trait CpgPassBase
class Object
trait Matchable
class Any
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object XTypeHintCallLinker

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Companion
class
Supertypes
class Object
trait Matchable
class Any
Self type
abstract class XTypeRecovery[CompilationUnitType <: AstNode](cpg: Cpg, state: XTypeRecoveryState, iteration: Int) extends ForkJoinParallelCpgPass[CompilationUnitType]

Based on a flow-insensitive static single-assignment symbol-table-style approach. This pass aims to be fast and deterministic and does not try to converge to some fixed point but rather iterates a fixed number of times. This will help recover:

Based on a flow-insensitive static single-assignment symbol-table-style approach. This pass aims to be fast and deterministic and does not try to converge to some fixed point but rather iterates a fixed number of times. This will help recover:

  • Imported call signatures from external dependencies
  • Dynamic type hints for mutable variables in a compilation unit.

The algorithm flows roughly as follows:

  • Scan for method signatures of methods for each compilation unit, either by internally defined methods or by reading import signatures. This includes looking for aliases, e.g. import foo as bar.
  • (Optionally) Prune these method signatures by checking their validity against the CPG.
  • Visit assignments to populate where variables are assigned a value to extrapolate its type. Store these values in a local symbol table. If a field is assigned a value, store this in the global table
  • Find instances of where these fields and variables are used and update their type information.
  • If this variable is the receiver of a call, make sure to set the type of the call accordingly.

The symbol tables use the SymbolTable class to track possible type information.
Note: Local symbols are cleared once a compilation unit is complete. This is to keep memory usage down while maximizing concurrency.

Type parameters

CompilationUnitType

the AstNode type used to represent a compilation unit of the language.

Value parameters

cpg

the CPG to recovery types for.

Attributes

Companion
object
Supertypes
class ForkJoinParallelCpgPass[CompilationUnitType]
class NewStyleCpgPassBase[CompilationUnitType]
trait CpgPassBase
class Object
trait Matchable
class Any
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object XTypeRecovery

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Companion
class
Supertypes
class Object
trait Matchable
class Any
Self type
case class XTypeRecoveryConfig(iterations: Int, enabledDummyTypes: Boolean)

Value parameters

enabledDummyTypes

whether to enable placeholder dummy values for partially resolved types during the final iteration.

iterations

the number of iterations to run.

Attributes

Supertypes
trait Serializable
trait Product
trait Equals
class Object
trait Matchable
class Any
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object XTypeRecoveryPassGenerator

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Companion
class
Supertypes
class Object
trait Matchable
class Any
Self type
abstract class XTypeRecoveryPassGenerator[CompilationUnitType <: AstNode](cpg: Cpg, config: XTypeRecoveryConfig)

In order to propagate types across compilation units, but avoid the poor scalability of a fixed-point algorithm, the number of iterations can be configured using the iterations parameter. Note that iterations < 2 will not provide any interprocedural type recovery capabilities.

In order to propagate types across compilation units, but avoid the poor scalability of a fixed-point algorithm, the number of iterations can be configured using the iterations parameter. Note that iterations < 2 will not provide any interprocedural type recovery capabilities.

Type parameters

CompilationUnitType

the AstNode type used to represent a compilation unit of the language.

Value parameters

cpg

the CPG to recovery types for.

Attributes

Companion
object
Supertypes
class Object
trait Matchable
class Any
class XTypeRecoveryState(val config: XTypeRecoveryConfig, var currentIteration: Int)

Value parameters

config

the user defined config.

currentIteration

the current iteration.

Attributes

Supertypes
class Object
trait Matchable
class Any
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