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42faabc552
Follow a naming structure similar to the data flow library: - `ControlFlowNode` -> `ControlFlow::Node`. - `CallableEntryNode` -> `ControlFlow::Nodes::EntryNode`. - `CallableExitNode` -> `ControlFlow::Nodes::ExitNode`. - `ControlFlowEdgeType` -> `ControlFlow::SuccessorType`. - `ControlFlowEdgeSuccessor` -> `ControlFlow::SuccessorTypes::NormalSuccessor`. - `ControlFlowEdgeConditional -> ControlFlow::SuccessorTypes::ConditionalSuccessor`. - `ControlFlowEdgeBoolean` -> `ControlFlow::SuccessorTypes::BooleanSuccessor`. - `ControlFlowEdgeNullness` -> `ControlFlow::SuccessorTypes::NullnessSuccessor`. - `ControlFlowEdgeMatching` -> `ControlFlow::SuccessorTypes::MatchingSuccessor`. - `ControlFlowEdgeEmptiness` -> `ControlFlow::SuccessorTypes::EmptinessSuccessor`. - `ControlFlowEdgeReturn` -> `ControlFlow::SuccessorTypes::ReturnSuccessor`. - `ControlFlowEdgeBreak` -> `ControlFlow::SuccessorTypes::BreakSuccessor`. - `ControlFlowEdgeContinue` -> `ControlFlow::SuccessorTypes::ContinueSuccessor`. - `ControlFlowEdgeGotoLabel` -> `ControlFlow::SuccessorTypes::GotoLabelSuccessor`. - `ControlFlowEdgeGotoCase` -> `ControlFlow::SuccessorTypes::GotoCaseSuccessor`. - `ControlFlowEdgeGotoDefault` -> `ControlFlow::SuccessorTypes::GotoDefaultSuccessor`. - `ControlFlowEdgeException` -> `ControlFlow::SuccessorTypes::ExceptionSuccessor`
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
import csharp
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/** "Naive" def-use implementation. */
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predicate defReaches(AssignableDefinition def, LocalScopeVariable v, ControlFlow::Node cfn) {
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def.getTarget() = v and cfn = def.getAControlFlowNode().getASuccessor()
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or
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exists(ControlFlow::Node mid |
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defReaches(def, v, mid) |
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not mid = any(AssignableDefinition ad | ad.getTarget() = v and ad.isCertain()).getAControlFlowNode() and
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cfn = mid.getASuccessor()
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)
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}
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predicate defUsePair(AssignableDefinition def, AssignableRead read) {
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exists(Assignable a |
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defReaches(def, a, read.getAControlFlowNode()) and
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read.getTarget() = a
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)
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}
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private LocalScopeVariableRead getAReachableUncertainRead(AssignableDefinition def) {
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exists(Ssa::Definition ssaDef |
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def = ssaDef.getAnUltimateDefinition().(Ssa::ExplicitDefinition).getADefinition() |
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result = ssaDef.getARead()
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)
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}
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from AssignableDefinition def, LocalScopeVariableRead read, string s
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where
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(read = getAReachableUncertainRead(def) and not defUsePair(def, read) and s = "not a def/use pair")
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or
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(defUsePair(def, read) and not read = getAReachableUncertainRead(def) and s = "missing def/use pair")
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select def, read, s
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