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Implement initial PoC for checking return values (#846)
Co-authored-by: Selina Lin <[email protected]> Co-authored-by: Robert Haimerl <[email protected]>
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...ds/cpg/src/main/kotlin/de/fraunhofer/aisec/codyze/backends/cpg/coko/dsl/DataItemCpgDsl.kt
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| @@ -0,0 +1,77 @@ | ||
| /* | ||
| * Copyright (c) 2022, Fraunhofer AISEC. All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package de.fraunhofer.aisec.codyze.backends.cpg.coko.dsl | ||
|
|
||
| import de.fraunhofer.aisec.codyze.backends.cpg.coko.Nodes | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.CokoBackend | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.modelling.ArgumentItem | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.modelling.DataItem | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.modelling.ReturnValueItem | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.modelling.Value | ||
| import de.fraunhofer.aisec.cpg.graph.* | ||
| import de.fraunhofer.aisec.cpg.graph.declarations.VariableDeclaration | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.Reference | ||
|
|
||
| /** | ||
| * Get all [Nodes] that are associated with this [DataItem]. | ||
| */ | ||
| context(CokoBackend) | ||
| fun DataItem<*>.cpgGetAllNodes(): Nodes = | ||
| when (this@DataItem) { | ||
| is ReturnValueItem -> op.cpgGetAllNodes().flatMap { it.getVariableInNextDFGOrThis() } | ||
| is Value -> this@DataItem.getNodes() | ||
| is ArgumentItem -> op.cpgGetAllNodes().map { it.arguments[index] } // TODO: Do we count starting at 0 or 1? | ||
| } | ||
|
|
||
| /** | ||
| * Get all [Nodes] that are associated with this [DataItem]. | ||
| */ | ||
| context(CokoBackend) | ||
| fun DataItem<*>.cpgGetNodes(): Nodes { | ||
| return when (this@DataItem) { | ||
| is ReturnValueItem -> op.cpgGetNodes().flatMap { it.getVariableInNextDFGOrThis() } | ||
| is Value -> this@DataItem.getNodes() | ||
| is ArgumentItem -> op.cpgGetNodes().map { it.arguments[index] } // TODO: Do we count starting at 0 or 1? | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Get all [Nodes] that evaluate to the same value as [Value.value]. | ||
| */ | ||
| context(CokoBackend) | ||
| private fun Value<*>.getNodes(): Nodes { | ||
| val value = this.value | ||
| return if (value is Node) { | ||
| listOf(value) | ||
| } else { | ||
| cpg.literals.filter { node -> | ||
| node.value == value | ||
| } + cpg.variables.filter { node -> | ||
| node.evaluate() == value | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns all [VariableDeclaration]s and [DeclaredReferenceExpression]s that have a DFG edge from [this]. | ||
| * If there are none, returns [this]. | ||
| */ | ||
| private fun Node.getVariableInNextDFGOrThis(): Nodes = | ||
| this.nextDFG | ||
| .filter { | ||
| next -> | ||
| next is Reference || next is VariableDeclaration | ||
| }.ifEmpty { listOf(this) } |
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