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io.joern.javasrc2cpg.astcreation.declarations.AstForMethodsCreator.scala Maven / Gradle / Ivy
package io.joern.javasrc2cpg.astcreation.declarations
import io.joern.x2cpg.utils.AstPropertiesUtil.*
import com.github.javaparser.ast.NodeList
import com.github.javaparser.ast.body.{
CallableDeclaration,
ConstructorDeclaration,
FieldDeclaration,
MethodDeclaration,
Parameter,
VariableDeclarator
}
import com.github.javaparser.ast.stmt.{BlockStmt, ExplicitConstructorInvocationStmt}
import com.github.javaparser.resolution.declarations.{ResolvedMethodDeclaration, ResolvedMethodLikeDeclaration}
import com.github.javaparser.resolution.types.ResolvedType
import com.github.javaparser.resolution.types.parametrization.ResolvedTypeParametersMap
import io.joern.javasrc2cpg.astcreation.{AstCreator, ExpectedType}
import io.joern.javasrc2cpg.typesolvers.TypeInfoCalculator.TypeConstants
import io.joern.javasrc2cpg.util.Util.*
import io.joern.x2cpg.utils.NodeBuilders
import io.joern.x2cpg.utils.NodeBuilders.*
import io.joern.x2cpg.{Ast, Defines}
import io.shiftleft.codepropertygraph.generated.nodes.{
NewBlock,
NewIdentifier,
NewMethod,
NewMethodParameterIn,
NewMethodReturn,
NewModifier
}
import io.shiftleft.codepropertygraph.generated.{EvaluationStrategies, ModifierTypes}
import io.joern.javasrc2cpg.scope.JavaScopeElement.fullName
import scala.jdk.CollectionConverters.*
import scala.jdk.OptionConverters.RichOptional
import scala.util.Try
import io.shiftleft.codepropertygraph.generated.nodes.AstNodeNew
import io.shiftleft.codepropertygraph.generated.nodes.NewCall
import io.shiftleft.codepropertygraph.generated.Operators
import io.shiftleft.codepropertygraph.generated.DispatchTypes
import io.shiftleft.codepropertygraph.generated.EdgeTypes
import com.github.javaparser.ast.Node
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserParameterDeclaration
import io.joern.javasrc2cpg.astcreation.declarations.AstForMethodsCreator.PartialConstructorDeclaration
private[declarations] trait AstForMethodsCreator { this: AstCreator =>
def astForMethod(methodDeclaration: MethodDeclaration): Ast = {
val methodNode = createPartialMethod(methodDeclaration)
val typeParameters = getIdentifiersForTypeParameters(methodDeclaration)
val maybeResolved = tryWithSafeStackOverflow(methodDeclaration.resolve())
val expectedReturnType = Try(symbolSolver.toResolvedType(methodDeclaration.getType, classOf[ResolvedType])).toOption
val simpleMethodReturnType = methodDeclaration.getTypeAsString()
val returnTypeFullName = expectedReturnType
.flatMap(typeInfoCalc.fullName)
.orElse(scope.lookupType(simpleMethodReturnType))
.orElse(
Try(methodDeclaration.getType.asClassOrInterfaceType).toOption.flatMap(t => scope.lookupType(t.getNameAsString))
)
.orElse(typeParameters.find(_.name == simpleMethodReturnType).map(_.typeFullName))
scope.pushMethodScope(
methodNode,
ExpectedType(returnTypeFullName, expectedReturnType),
methodDeclaration.isStatic()
)
typeParameters.foreach { typeParameter => scope.addTopLevelType(typeParameter.name, typeParameter.typeFullName) }
val parameterAsts = astsForParameterList(methodDeclaration.getParameters)
val parameterTypes = argumentTypesForMethodLike(maybeResolved)
val signature = composeSignature(returnTypeFullName, parameterTypes, parameterAsts.size)
val namespaceName = scope.enclosingTypeDecl.fullName.getOrElse(Defines.UnresolvedNamespace)
val methodFullName = composeMethodFullName(namespaceName, methodDeclaration.getNameAsString, signature)
methodNode
.fullName(methodFullName)
.signature(signature)
val thisNode = Option.when(!methodDeclaration.isStatic) {
val typeFullName = scope.enclosingTypeDecl.fullName
thisNodeForMethod(typeFullName, line(methodDeclaration))
}
val thisAst = thisNode.map(Ast(_)).toList
thisNode.foreach { node =>
scope.enclosingMethod.get.addParameter(node)
}
val bodyAst = methodDeclaration.getBody.toScala.map(astForBlockStatement(_)).getOrElse(Ast(NewBlock()))
val methodReturn = newMethodReturnNode(
returnTypeFullName.getOrElse(TypeConstants.Any),
None,
line(methodDeclaration.getType),
column(methodDeclaration.getType)
)
val annotationAsts = methodDeclaration.getAnnotations.asScala.map(astForAnnotationExpr).toSeq
val modifiers = modifiersForMethod(methodDeclaration)
scope.popMethodScope()
methodAstWithAnnotations(methodNode, thisAst ++ parameterAsts, bodyAst, methodReturn, modifiers, annotationAsts)
}
private def abstractModifierForCallable(
callableDeclaration: CallableDeclaration[?],
isInterfaceMethod: Boolean
): Option[NewModifier] = {
callableDeclaration match {
case methodDeclaration: MethodDeclaration =>
Option.when(methodDeclaration.isAbstract || (isInterfaceMethod && !methodDeclaration.isDefault)) {
newModifierNode(ModifierTypes.ABSTRACT)
}
case _ => None
}
}
private def modifiersForMethod(methodDeclaration: CallableDeclaration[?]): List[NewModifier] = {
val isInterfaceMethod = scope.enclosingTypeDecl.isInterface
val abstractModifier = abstractModifierForCallable(methodDeclaration, isInterfaceMethod)
val staticVirtualModifierType = if (methodDeclaration.isStatic) ModifierTypes.STATIC else ModifierTypes.VIRTUAL
val staticVirtualModifier = Some(newModifierNode(staticVirtualModifierType))
val accessModifierType = if (methodDeclaration.isPublic) {
Some(ModifierTypes.PUBLIC)
} else if (methodDeclaration.isPrivate) {
Some(ModifierTypes.PRIVATE)
} else if (methodDeclaration.isProtected) {
Some(ModifierTypes.PROTECTED)
} else if (isInterfaceMethod) {
// TODO: more robust interface check
Some(ModifierTypes.PUBLIC)
} else {
None
}
val accessModifier = accessModifierType.map(newModifierNode)
List(accessModifier, abstractModifier, staticVirtualModifier).flatten
}
private def getIdentifiersForTypeParameters(methodDeclaration: MethodDeclaration): List[NewIdentifier] = {
methodDeclaration.getTypeParameters.asScala.map { typeParameter =>
val name = typeParameter.getNameAsString
val typeFullName = typeParameter.getTypeBound.asScala.headOption
.flatMap(typeInfoCalc.fullName)
.getOrElse(TypeConstants.Object)
typeInfoCalc.registerType(typeFullName)
NewIdentifier().name(name).typeFullName(typeFullName)
}.toList
}
def clinitAstFromStaticInits(staticInits: Seq[Ast]): Option[Ast] = {
Option.when(staticInits.nonEmpty) {
val signature = composeMethodLikeSignature(TypeConstants.Void, Nil)
val enclosingDeclName = scope.enclosingTypeDecl.fullName.getOrElse(Defines.UnresolvedNamespace)
val fullName = composeMethodFullName(enclosingDeclName, Defines.StaticInitMethodName, signature)
staticInitMethodAst(staticInits.toList, fullName, Some(signature), TypeConstants.Void)
}
}
private def astsForFieldInitializers(fieldDeclarations: List[FieldDeclaration]): List[Ast] = {
fieldDeclarations.flatMap { fieldDeclaration =>
fieldDeclaration.getVariables.asScala.filter(_.getInitializer.isPresent).toList.flatMap { variableDeclaration =>
scope.pushFieldDeclScope(fieldDeclaration.isStatic, variableDeclaration.getNameAsString)
val assignmentAsts = astsForVariableDeclarator(variableDeclaration, fieldDeclaration)
scope.popFieldDeclScope()
assignmentAsts
}
}
}
def astForDefaultConstructor(originNode: Node, instanceFieldDeclarations: List[FieldDeclaration]): Ast = {
val typeFullName = scope.enclosingTypeDecl.fullName
val signature = s"${TypeConstants.Void}()"
val fullName = composeMethodFullName(
typeFullName.getOrElse(Defines.UnresolvedNamespace),
Defines.ConstructorMethodName,
signature
)
val constructorNode = NewMethod()
.name(io.joern.x2cpg.Defines.ConstructorMethodName)
.fullName(fullName)
.signature(signature)
.filename(filename)
.isExternal(false)
scope.pushMethodScope(constructorNode, ExpectedType.Void, isStatic = false)
val thisNode = thisNodeForMethod(typeFullName, lineNumber = None)
scope.enclosingMethod.foreach(_.addParameter(thisNode))
val bodyStatementAsts = astsForFieldInitializers(instanceFieldDeclarations)
val returnNode = newMethodReturnNode(TypeConstants.Void, line = None, column = None)
val modifiers = List(newModifierNode(ModifierTypes.CONSTRUCTOR), newModifierNode(ModifierTypes.PUBLIC))
val partialConstructor =
PartialConstructorDeclaration(
originNode,
constructorNode,
thisNode,
explicitParameterAsts = Nil,
bodyStatementAsts = bodyStatementAsts,
methodReturn = returnNode,
annotationAsts = Nil,
modifiers = modifiers,
startsWithThisCall = false
)
val constructorAst = completePartialConstructor(partialConstructor)
scope.popMethodScope()
constructorAst
}
private def astForParameter(parameter: Parameter, childNum: Int): Ast = {
val maybeArraySuffix = if (parameter.isVarArgs) "[]" else ""
val typeFullName =
typeInfoCalc
.fullName(parameter.getType)
.orElse(scope.lookupType(parameter.getTypeAsString))
// In a scenario where we have an import of an external type e.g. `import foo.bar.Baz` and
// this parameter's type is e.g. `Baz`, the lookup will fail. However, if we lookup
// for `Baz` instead (i.e. without type arguments), then the lookup will succeed.
.orElse(
Try(parameter.getType.asClassOrInterfaceType).toOption.flatMap(t => scope.lookupType(t.getNameAsString))
)
.map(_ ++ maybeArraySuffix)
.getOrElse(s"${Defines.UnresolvedNamespace}.${parameter.getTypeAsString}")
val evalStrat =
if (parameter.getType.isPrimitiveType) EvaluationStrategies.BY_VALUE else EvaluationStrategies.BY_SHARING
typeInfoCalc.registerType(typeFullName)
val parameterNode = NewMethodParameterIn()
.name(parameter.getName.toString)
.code(parameter.toString)
.lineNumber(line(parameter))
.columnNumber(column(parameter))
.evaluationStrategy(evalStrat)
.typeFullName(typeFullName)
.index(childNum)
.order(childNum)
val annotationAsts = parameter.getAnnotations.asScala.map(astForAnnotationExpr)
val ast = Ast(parameterNode)
scope.enclosingMethod.get.addParameter(parameterNode)
ast.withChildren(annotationAsts)
}
def calcParameterTypes(
methodLike: ResolvedMethodLikeDeclaration,
typeParamValues: ResolvedTypeParametersMap
): Option[List[String]] = {
val parameterTypes =
Range(0, methodLike.getNumberOfParams)
.flatMap { index =>
Try(methodLike.getParam(index)).toOption
}
.map { param =>
Try(param.getType).toOption
.flatMap(paramType => typeInfoCalc.fullName(paramType, typeParamValues))
// In a scenario where we have an import of an external type e.g. `import foo.bar.Baz` and
// this parameter's type is e.g. `Baz`, the lookup will fail. However, if we lookup
// for `Baz` instead (i.e. without type arguments), then the lookup will succeed.
.orElse(
Try(
param.asInstanceOf[JavaParserParameterDeclaration].getWrappedNode.getType.asClassOrInterfaceType
).toOption.flatMap(t => scope.lookupType(t.getNameAsString))
)
}
toOptionList(parameterTypes)
}
def composeSignature(
maybeReturnType: Option[String],
maybeParameterTypes: Option[List[String]],
parameterCount: Int
): String = {
(maybeReturnType, maybeParameterTypes) match {
case (Some(returnType), Some(parameterTypes)) =>
composeMethodLikeSignature(returnType, parameterTypes)
case _ =>
composeUnresolvedSignature(parameterCount)
}
}
def methodSignature(method: ResolvedMethodDeclaration, typeParamValues: ResolvedTypeParametersMap): String = {
val maybeParameterTypes = calcParameterTypes(method, typeParamValues)
val maybeReturnType =
Try(method.getReturnType).toOption
.flatMap(returnType => typeInfoCalc.fullName(returnType, typeParamValues))
composeSignature(maybeReturnType, maybeParameterTypes, method.getNumberOfParams)
}
private def astsForParameterList(parameters: NodeList[Parameter]): Seq[Ast] = {
parameters.asScala.toList.zipWithIndex.map { case (param, idx) =>
astForParameter(param, idx + 1)
}
}
private def partialConstructorAsts(
constructorDeclarations: List[ConstructorDeclaration],
instanceFieldDeclarations: List[FieldDeclaration]
): List[PartialConstructorDeclaration] = {
constructorDeclarations.map { constructorDeclaration =>
val constructorNode = createPartialMethod(constructorDeclaration)
.name(io.joern.x2cpg.Defines.ConstructorMethodName)
scope.pushMethodScope(constructorNode, ExpectedType.Void, isStatic = false)
val maybeResolved = tryWithSafeStackOverflow(constructorDeclaration.resolve())
val parameterAsts = astsForParameterList(constructorDeclaration.getParameters).toList
val paramTypes = argumentTypesForMethodLike(maybeResolved)
val signature = composeSignature(Some(TypeConstants.Void), paramTypes, parameterAsts.size)
val typeFullName = scope.enclosingTypeDecl.fullName
val fullName =
composeMethodFullName(
typeFullName.getOrElse(Defines.UnresolvedNamespace),
Defines.ConstructorMethodName,
signature
)
constructorNode
.fullName(fullName)
.signature(signature)
parameterAsts.foreach { ast =>
ast.root match {
case Some(parameter: NewMethodParameterIn) => scope.enclosingMethod.get.addParameter(parameter)
case _ => // This should never happen
}
}
val thisNode = thisNodeForMethod(typeFullName, line(constructorDeclaration))
scope.enclosingMethod.get.addParameter(thisNode)
scope.pushBlockScope()
val bodyStatements = constructorDeclaration.getBody.getStatements.asScala.toList
val bodyContainsThis = bodyStatements.headOption
.collect { case consInvocation: ExplicitConstructorInvocationStmt => consInvocation.isThis }
.getOrElse(false)
val fieldAssignments =
if (bodyContainsThis)
Nil
else
astsForFieldInitializers(instanceFieldDeclarations)
// The this(...) call must always be the first statement in the body, but adding the fieldAssignments
// before the body asts here is safe, since the list will be empty if the body does start with this()
val bodyAsts = fieldAssignments ++ bodyStatements.flatMap(astsForStatement)
scope.popBlockScope()
val methodReturn = constructorReturnNode(constructorDeclaration)
val annotationAsts = constructorDeclaration.getAnnotations.asScala.map(astForAnnotationExpr).toList
val modifiers =
NewModifier().modifierType(ModifierTypes.CONSTRUCTOR) :: modifiersForMethod(constructorDeclaration).filterNot(
_.modifierType == ModifierTypes.VIRTUAL
)
scope.popMethodScope()
PartialConstructorDeclaration(
constructorDeclaration,
constructorNode,
thisNode,
parameterAsts,
bodyAsts.toList,
methodReturn,
annotationAsts,
modifiers,
bodyContainsThis
)
}
}
private def assignmentForCapture(
originNode: Node,
parameter: NewMethodParameterIn,
thisParam: NewMethodParameterIn
): Ast = {
val assignment =
newOperatorCallNode(
Operators.assignment,
s"this.${parameter.name} = ${parameter.name}",
Some(parameter.typeFullName),
parameter.lineNumber,
parameter.columnNumber
)
val fieldAccess = newOperatorCallNode(
Operators.fieldAccess,
s"this.${parameter.name}",
Some(thisParam.typeFullName),
parameter.lineNumber,
parameter.columnNumber
)
val fieldAccessTarget =
identifierNode(originNode, "this", "this", thisParam.typeFullName, List(thisParam.typeFullName))
val fieldIdentifier = fieldIdentifierNode(originNode, parameter.name, parameter.name)
val sourceIdentifier =
identifierNode(originNode, parameter.name, parameter.name, parameter.typeFullName)
diffGraph.addEdge(fieldAccessTarget, thisParam, EdgeTypes.REF)
diffGraph.addEdge(sourceIdentifier, parameter, EdgeTypes.REF)
val fieldAccessAst = callAst(fieldAccess, List(fieldAccessTarget, fieldIdentifier).map(Ast(_)))
callAst(assignment, List(fieldAccessAst, Ast(sourceIdentifier)))
}
private def completePartialConstructor(partialConstructor: PartialConstructorDeclaration): Ast = {
val paramsForCaptures = scope.enclosingTypeDecl.getUsedCaptures().zipWithIndex.map { case (variable, index) =>
parameterInNode(
partialConstructor.originNode,
variable.name,
variable.name,
partialConstructor.explicitParameterAsts.length + 1 + index,
isVariadic = false,
EvaluationStrategies.BY_VALUE,
variable.typeFullName
)
}
val thisNode = partialConstructor.thisNode
val assignmentsForCaptures =
if (partialConstructor.startsWithThisCall)
Nil
else
paramsForCaptures.map(assignmentForCapture(partialConstructor.originNode, _, partialConstructor.thisNode))
val bodyAst =
astForConstructorBody(partialConstructor.originNode, partialConstructor.bodyStatementAsts, assignmentsForCaptures)
methodAstWithAnnotations(
partialConstructor.constructorNode,
Ast(partialConstructor.thisNode) :: (partialConstructor.explicitParameterAsts ++ paramsForCaptures.map(Ast(_))),
bodyAst,
partialConstructor.methodReturn,
partialConstructor.modifiers,
partialConstructor.annotationAsts
)
}
def astsForConstructors(
constructorDeclarations: List[ConstructorDeclaration],
instanceFieldDeclarations: List[FieldDeclaration]
): Map[Node, Ast] = {
val partialConstructors = partialConstructorAsts(constructorDeclarations, instanceFieldDeclarations)
partialConstructors.map { partialConstructor =>
partialConstructor.originNode -> completePartialConstructor(partialConstructor)
}.toMap
}
private def constructorReturnNode(constructorDeclaration: ConstructorDeclaration): NewMethodReturn = {
val line = constructorDeclaration.getEnd.map(x => Integer.valueOf(x.line)).toScala
val column = constructorDeclaration.getEnd.map(x => Integer.valueOf(x.column)).toScala
newMethodReturnNode(TypeConstants.Void, None, line, column)
}
private def astForConstructorBody(originNode: Node, bodyStmts: List[Ast], captureInitializers: List[Ast]): Ast = {
val hasThisCall = bodyStmts.headOption
.flatMap(_.root)
.collect { case thisCall: NewCall => thisCall.name == "" }
.getOrElse(false)
val statementsInOrder = bodyStmts match {
case Nil => captureInitializers
case head :: tail if hasThisCall =>
head :: (captureInitializers ++ tail)
case bodyStmts => captureInitializers ++ bodyStmts
}
Ast(blockNode(originNode)).withChildren(statementsInOrder)
}
/** Constructor and Method declarations share a lot of fields, so this method adds the fields they have in common.
* `fullName` and `signature` are omitted
*/
private def createPartialMethod(declaration: CallableDeclaration[?]): NewMethod = {
val code = declaration.getDeclarationAsString.trim
val columnNumber = declaration.getBegin.map(x => Integer.valueOf(x.column)).toScala
val endLine = declaration.getEnd.map(x => Integer.valueOf(x.line)).toScala
val endColumn = declaration.getEnd.map(x => Integer.valueOf(x.column)).toScala
val placeholderFullName = ""
methodNode(declaration, declaration.getNameAsString(), code, placeholderFullName, None, filename)
}
def thisNodeForMethod(maybeTypeFullName: Option[String], lineNumber: Option[Integer]): NewMethodParameterIn = {
val typeFullName = typeInfoCalc.registerType(maybeTypeFullName.getOrElse(TypeConstants.Any))
NodeBuilders.newThisParameterNode(
typeFullName = typeFullName,
dynamicTypeHintFullName = maybeTypeFullName.toSeq,
line = lineNumber
)
}
}
object AstForMethodsCreator {
private case class PartialConstructorDeclaration(
originNode: Node,
constructorNode: NewMethod,
thisNode: NewMethodParameterIn,
explicitParameterAsts: List[Ast],
bodyStatementAsts: List[Ast],
methodReturn: NewMethodReturn,
annotationAsts: List[Ast],
modifiers: List[NewModifier],
startsWithThisCall: Boolean
)
}
