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Copy pathNumberFormatException.qll
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70 lines (61 loc) · 2.52 KB
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/** Provides classes and predicates for reasoning about `java.lang.NumberFormatException`. */
overlay[local?]
module;
import java
/** A call to a string to number conversion. */
private class SpecialMethodCall extends MethodCall {
predicate isValueOfMethod(string klass) {
this.getMethod().getName() = "valueOf" and
this.getQualifier().getType().(RefType).hasQualifiedName("java.lang", klass) and
this.getAnArgument().getType().(RefType).hasQualifiedName("java.lang", "String")
}
predicate isParseMethod(string klass, string name) {
this.getMethod().getName() = name and
this.getQualifier().getType().(RefType).hasQualifiedName("java.lang", klass)
}
predicate throwsNfe() {
this.isParseMethod("Byte", "parseByte") or
this.isParseMethod("Short", "parseShort") or
this.isParseMethod("Integer", "parseInt") or
this.isParseMethod("Long", "parseLong") or
this.isParseMethod("Float", "parseFloat") or
this.isParseMethod("Double", "parseDouble") or
this.isParseMethod("Byte", "decode") or
this.isParseMethod("Short", "decode") or
this.isParseMethod("Integer", "decode") or
this.isParseMethod("Long", "decode") or
this.isValueOfMethod("Byte") or
this.isValueOfMethod("Short") or
this.isValueOfMethod("Integer") or
this.isValueOfMethod("Long") or
this.isValueOfMethod("Float") or
this.isValueOfMethod("Double")
}
}
/** A `ClassInstanceExpr` that constructs a number from its string representation. */
private class SpecialClassInstanceExpr extends ClassInstanceExpr {
predicate isStringConstructor(string klass) {
this.getType().(RefType).hasQualifiedName("java.lang", klass) and
this.getAnArgument().getType().(RefType).hasQualifiedName("java.lang", "String") and
this.getNumArgument() = 1
}
predicate throwsNfe() {
this.isStringConstructor(["Byte", "Short", "Integer", "Long", "Float", "Double"])
}
}
/** The class `java.lang.NumberFormatException`. */
class NumberFormatException extends RefType {
NumberFormatException() { this.hasQualifiedName("java.lang", "NumberFormatException") }
}
/** Holds if `java.lang.NumberFormatException` is caught. */
predicate catchesNfe(TryStmt t) {
exists(CatchClause cc, LocalVariableDeclExpr v |
t.getACatchClause() = cc and
cc.getVariable() = v and
v.getType().(RefType).getADescendant() instanceof NumberFormatException
)
}
/** Holds if `java.lang.NumberFormatException` can be thrown. */
predicate throwsNfe(Expr e) {
e.(SpecialClassInstanceExpr).throwsNfe() or e.(SpecialMethodCall).throwsNfe()
}