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Added a
LookupScopeStatement node (#1742)
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61
cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/statements/LookupScopeStatement.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * Copyright (c) 2024, 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.cpg.graph.statements | ||
|
|
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| import de.fraunhofer.aisec.cpg.graph.newLookupScopeStatement | ||
| import de.fraunhofer.aisec.cpg.graph.scopes.Scope | ||
| import de.fraunhofer.aisec.cpg.graph.scopes.Symbol | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.Reference | ||
| import java.util.Objects | ||
|
|
||
| /** | ||
| * This statement modifies the lookup scope of one or more [Reference] nodes (or more precise it's | ||
| * symbols) within the current [Scope]. The most prominent example of this are the Python `global` | ||
| * and `nonlocal` keywords. | ||
| * | ||
| * This node itself does not implement the actual functionality. It is necessary to add this node | ||
| * (or the information therein) to [Scope.predefinedLookupScopes]. The reason for this is that we | ||
| * want to avoid AST traversals in the scope/identifier lookup. | ||
| * | ||
| * The [newLookupScopeStatement] node builder will add this automatically, so it is STRONGLY | ||
| * encouraged that the node builder is used instead of creating the node itself. | ||
| */ | ||
| class LookupScopeStatement : Statement() { | ||
|
|
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| /** The symbols this statement affects. */ | ||
| var symbols: List<Symbol> = listOf() | ||
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| /** The target scope to which the references are referring to. */ | ||
| var targetScope: Scope? = null | ||
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| override fun equals(other: Any?): Boolean { | ||
| if (this === other) return true | ||
| if (other !is LookupScopeStatement) return false | ||
| return super.equals(other) && symbols == other.symbols && targetScope == other.targetScope | ||
| } | ||
|
|
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| override fun hashCode() = Objects.hash(super.hashCode(), symbols, targetScope) | ||
| } |
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98 changes: 98 additions & 0 deletions
98
cpg-core/src/test/kotlin/de/fraunhofer/aisec/cpg/graph/StatementBuilderTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * Copyright (c) 2024, 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.cpg.graph | ||
|
|
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| import de.fraunhofer.aisec.cpg.ScopeManager | ||
| import de.fraunhofer.aisec.cpg.TranslationConfiguration | ||
| import de.fraunhofer.aisec.cpg.TranslationContext | ||
| import de.fraunhofer.aisec.cpg.TypeManager | ||
| import de.fraunhofer.aisec.cpg.frontends.TestLanguageFrontend | ||
| import de.fraunhofer.aisec.cpg.graph.builder.translationResult | ||
| import de.fraunhofer.aisec.cpg.graph.scopes.GlobalScope | ||
| import de.fraunhofer.aisec.cpg.test.assertRefersTo | ||
| import kotlin.test.Test | ||
| import kotlin.test.assertIs | ||
| import kotlin.test.assertNotNull | ||
|
|
||
| class StatementBuilderTest { | ||
| @Test | ||
| fun testNewLookupScopeStatement() { | ||
| val frontend = | ||
| TestLanguageFrontend( | ||
| ctx = | ||
| TranslationContext( | ||
| TranslationConfiguration.builder().defaultPasses().build(), | ||
| ScopeManager(), | ||
| TypeManager() | ||
| ) | ||
| ) | ||
| val result = | ||
| frontend.build { | ||
| translationResult { | ||
| var tu = | ||
| with(frontend) { | ||
| var tu = newTranslationUnitDeclaration("main.file") | ||
| scopeManager.resetToGlobal(tu) | ||
|
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| var globalA = newVariableDeclaration("a") | ||
| scopeManager.addDeclaration(globalA) | ||
|
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| var func = newFunctionDeclaration("main") | ||
| scopeManager.enterScope(func) | ||
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| var body = newBlock() | ||
| scopeManager.enterScope(body) | ||
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| var localA = newVariableDeclaration("a") | ||
| var stmt = newDeclarationStatement() | ||
| stmt.declarations += localA | ||
| scopeManager.addDeclaration(localA) | ||
| body += stmt | ||
|
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| body += newLookupScopeStatement(listOf("a"), scopeManager.globalScope) | ||
| body += newReference("a") | ||
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| scopeManager.leaveScope(body) | ||
| func.body = body | ||
| scopeManager.leaveScope(func) | ||
|
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| scopeManager.addDeclaration(func) | ||
| scopeManager.leaveScope(tu) | ||
| tu | ||
| } | ||
|
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| components.firstOrNull()?.translationUnits?.add(tu) | ||
| } | ||
| } | ||
|
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| val globalA = result.variables["a"] | ||
| assertNotNull(globalA) | ||
| assertIs<GlobalScope>(globalA.scope) | ||
|
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| val a = result.refs["a"] | ||
| assertRefersTo(a, globalA) | ||
| } | ||
| } |
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