Merge pull request #8431 from erik-krogh/deadCode

Delete dead code

java/ql/src/Likely Bugs/Concurrency/BusyWait.ql

@@ -16,13 +16,6 @@
 
 import java
 
-class ReachFromStmt extends Stmt {
-  ReachFromStmt() {
-    exists(Method m | m.getBody() = this) or
-    exists(WhileStmt w | w.getStmt() = this)
-  }
-}
-
 class SleepMethod extends Method {
   SleepMethod() {
     this.getName() = "sleep" and

java/ql/src/Performance/ConcatenationInLoops.ql

@@ -15,11 +15,6 @@ import semmle.code.java.Expr
 import semmle.code.java.Statement
 import semmle.code.java.JDK
 
-/** A use of `+` that has type `String`. */
-class StringCat extends AddExpr {
-  StringCat() { this.getType() instanceof TypeString }
-}
-
 /**
  * An assignment of the form
  *

java/ql/src/experimental/Security/CWE/CWE-759/HashWithoutSalt.ql

@@ -36,16 +36,6 @@ class MessageDigest extends RefType {
   MessageDigest() { this.hasQualifiedName("java.security", "MessageDigest") }
 }
 
-/** The method call `MessageDigest.getInstance(...)` */
-class MDConstructor extends StaticMethodAccess {
-  MDConstructor() {
-    exists(Method m | m = this.getMethod() |
-      m.getDeclaringType() instanceof MessageDigest and
-      m.hasName("getInstance")
-    )
-  }
-}
-
 /** The method `digest()` declared in `java.security.MessageDigest`. */
 class MDDigestMethod extends Method {
   MDDigestMethod() {