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43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
import csharp
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private import semmle.code.csharp.dataflow.internal.BaseSSA
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/** "Naive" parameter-use implementation. */
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predicate parameterReaches(Parameter p, ControlFlowNode cfn) {
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cfn = p.getCallable().getEntryPoint().getASuccessor() and
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p instanceof BaseSsa::SimpleLocalScopeVariable
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or
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exists(ControlFlowNode mid | parameterReaches(p, mid) |
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not mid =
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any(AssignableDefinition ad | ad.getTarget() = p and ad.isCertain())
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.getExpr()
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.getControlFlowNode() and
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cfn = mid.getASuccessor()
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)
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}
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predicate parameterUsePair(Parameter p, AssignableRead read) {
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parameterReaches(p, read.getControlFlowNode()) and
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read.getTarget() = p
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}
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private LocalScopeVariableRead getAReachableUncertainRead(
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AssignableDefinitions::ImplicitParameterDefinition p
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) {
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exists(SsaDefinition ssaDef |
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p.getParameter() = ssaDef.getAnUltimateDefinition().(SsaParameterInit).getParameter()
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result = ssaDef.getARead()
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)
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}
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from AssignableDefinitions::ImplicitParameterDefinition p, AssignableRead read, string s
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where
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read = getAReachableUncertainRead(p) and
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not parameterUsePair(p.getParameter(), read) and
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s = "not a param/use pair"
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or
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parameterUsePair(p.getParameter(), read) and
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not read = getAReachableUncertainRead(p) and
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s = "missing param/use pair"
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select p, read, s
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