/**
* Checks whether the given statement is the end of an implicit flow. If this is the case, then
* the corresponding if statement which is the start of this implicit flow will be removed from
* the program counter in the outgoing locals map. Note, that the method will not change the
* incoming locals map.
*
* @param statement Statement for which should be checked whether it is the end of an implicit
* flow.
* @param in Current incoming map of the local variables.
* @param out Current outgoing map of the local variables.
*/
private void checkEndOfImplicitFlow(Stmt statement, LocalsMap in, LocalsMap out) {
List<IfStmt> ifStmts = new ArrayList<IfStmt>(in.getProgramCounter().keySet());
for (IfStmt ifStmt : ifStmts) {
if (getContainer().postDomSetOfStmtContainsS(ifStmt, statement)) {
out.removeProgramCounterLevel(ifStmt);
}
}
}
/**
* Compute the merge of the <code>in1</code> and <code>in2</code> locals maps, putting the result
* into <code>out</code>. The behavior of this function is that the strongest <em>security
* level</em> which exists for a local variable in <code>in1</code> or <code>in2</code>, is taken
* for the <code>out</code> locals map. Used by the {@link SecurityLevelAnalysis#doAnalysis()}
* method.
*
* @param in1 First locals map that should be merged together with the second map.
* @param in2 Second locals map that should be merged together with the first map.
* @param out Outgoing locals map that should store the result of the merge of <code>in1</code>
* and <code>in2</code>.
* @see soot.toolkits.scalar.AbstractFlowAnalysis#merge(java.lang.Object, java.lang.Object,
* java.lang.Object)
*/
@Override
protected void merge(LocalsMap in1, LocalsMap in2, LocalsMap out) {
copy(in1, out);
out.addAllStronger(in2.getExtendedLocals());
}
/**
* Creates a copy of the <code>source</code> flow object, i.e. the locals map, in <code>dest
* </code>.
*
* @param source The locals map that should be copied in the given outgoing map.
* @param dest The locals map in which the state of the first given locals map should be copied.
* @see soot.toolkits.scalar.AbstractFlowAnalysis#copy(java.lang.Object, java.lang.Object)
*/
@Override
protected void copy(LocalsMap source, LocalsMap dest) {
dest.clear();
dest.addAll(source.getExtendedLocals(), source.getProgramCounter());
}