Added basic implementation of operator overloading #1606
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This was referenced Jul 1, 2024
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oxisto
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Since the frontend has to implement this feature, it would make sense to add this to the documentation page https://github.com/Fraunhofer-AISEC/cpg/blob/main/docs/docs/CPG/impl/language.md |
cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/LanguageTraits.kt
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cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/ArgumentHolder.kt
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cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/StatementHolder.kt
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cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/edges/collections/EdgeList.kt
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...c/main/kotlin/de/fraunhofer/aisec/cpg/graph/statements/expressions/OperatorCallExpression.kt
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...language-python/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/python/StatementHandler.kt
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konradweiss
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cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/SymbolResolver.kt
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konradweiss
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Sep 12, 2024
This PR makes sure that Python now properly uses our `TypeResolver` by only setting the unqualified name for a type and let the type resolver handle the rest. Otherwise we will get incorrect results, e.g., when retrieving name of a type within a class.
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This PR adds basic functionality for resolving operator overloading for languages that support it (via the trait
HasOperatorOverloading- which is currently python and C++). The respective frontend looks for function declarations that match entries inoverloadedOperatorNamesand creates anOperatorDeclaration.The
SymbolResolveris then looking for specific expressions (that implementHasOverloadedOperation) to see whether the expression is really an overloaded call to an operator declaration. In this case, the expression is replaced with anOperatorCallExpression, pointing to the respectiveOperatorDeclaration. This happens only if a declaration was found, currently, noOperatorDeclarationis inferred. This might be something for the future.Currently the following nodes support
HasOverloadedOperationand should work:BinaryOperator: Tested in C++ and PythonUnaryOperator: Tested in C++ and PythonMemberExpression: Only really possible in C++, also tested in C++. This is basically the main trick behind every smart pointer framework by overriding the->operator.CallExpression: Not testedThere are probably more expressions, such as array indices, etc. that currently do not implement
HasOverloadedOperationyet.This PR depends on the following PRs which need to be resolved first:
OperatorDeclaration#1605