void
evaluateAnalysisStates::visit(const Function& func, const DataflowNode& n, NodeState& state)
{
SgFunctionCallExp *fnCall = isSgFunctionCallExp(n.getNode());
if (!fnCall)
return;
if (!fnCall->getAssociatedFunctionSymbol())
return;
string funcName = fnCall->getAssociatedFunctionSymbol()->get_name().getString();
if (funcName.find("testFunc") == string::npos)
return;
FiniteVarsExprsProductLattice *lat = dynamic_cast<FiniteVarsExprsProductLattice *>(state.getLatticeAbove(div)[0]);
cout << indent << "Lattice before call to " << funcName << ": " << lat->str() << endl;
set<varID> allVars = lat->getAllVars();
for (set<varID>::iterator i = allVars.begin(); i != allVars.end(); ++i)
{
string name = i->str();
cout << "Variable " << name << " ";
if (expectations[funcName].find(name) == expectations[funcName].end())
{
cout << "unspecified" << endl;
continue;
}
Lattice *got = lat->getVarLattice(*i);
ROSE_ASSERT(got);
if (expectations[funcName][name] != got)
{
cout << "mismatched: " << got->str() << " was not the expected " << expectations[funcName][name].str();
numFails++;
}
else
{
cout << "matched";
numPass++;
}
cout << endl;
}
}
bool
TaintAnalysis::transfer(const Function& func, const DataflowNode& node_, NodeState& state, const std::vector<Lattice*>& dfInfo) {
static size_t ncalls = 0;
if (debug) {
*debug <<"TaintAnalysis::transfer-" <<++ncalls <<"(func=" <<func.get_name() <<",\n"
<<" node={" <<StringUtility::makeOneLine(node_.toString()) <<"},\n"
<<" state={" <<state.str(this, " ") <<",\n"
<<" dfInfo[" <<dfInfo.size() <<"]={...})\n";
}
SgNode *node = node_.getNode();
assert(!dfInfo.empty());
FiniteVarsExprsProductLattice *prodLat = dynamic_cast<FiniteVarsExprsProductLattice*>(dfInfo.front());
bool modified = magic_tainted(node, prodLat); // some values are automatically tainted based on their name
// Process AST nodes that transfer taintedness. Most of these operations have one or more inputs from which a result
// is always calculated the same way. So we just gather up the inputs and do the calculation at the very end of this
// function. The other operations are handled individually within their "if" bodies.
TaintLattice *result = NULL; // result pointer into the taint lattice
std::vector<TaintLattice*> inputs; // input pointers into the taint lattice
if (isSgAssignInitializer(node)) {
// as in "int a = b"
SgAssignInitializer *xop = isSgAssignInitializer(node);
TaintLattice *in1 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(SgExpr2Var(xop->get_operand())));
inputs.push_back(in1);
} else if (isSgAggregateInitializer(node)) {
// as in "int a[1] = {b}"
SgAggregateInitializer *xop = isSgAggregateInitializer(node);
const SgExpressionPtrList &exprs = xop->get_initializers()->get_expressions();
for (size_t i=0; i<exprs.size(); ++i) {
varID in_id = SgExpr2Var(exprs[i]);
TaintLattice *in = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in_id));
inputs.push_back(in);
}
} else if (isSgInitializedName(node)) {
SgInitializedName *xop = isSgInitializedName(node);
if (xop->get_initializer()) {
varID in1_id = SgExpr2Var(xop->get_initializer());
TaintLattice *in1 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in1_id));
inputs.push_back(in1);
}
} else if (isSgValueExp(node)) {
// numeric and character constants
SgValueExp *xop = isSgValueExp(node);
result = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(SgExpr2Var(xop)));
if (result)
modified = result->set_vertex(TaintLattice::VERTEX_UNTAINTED);
} else if (isSgAddressOfOp(node)) {
// as in "&x". The result taintedness has nothing to do with the value in x.
/*void*/
} else if (isSgBinaryOp(node)) {
// as in "a + b"
SgBinaryOp *xop = isSgBinaryOp(node);
varID in1_id = SgExpr2Var(isSgExpression(xop->get_lhs_operand()));
TaintLattice *in1 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in1_id));
inputs.push_back(in1);
varID in2_id = SgExpr2Var(isSgExpression(xop->get_rhs_operand()));
TaintLattice *in2 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in2_id));
inputs.push_back(in2);
if (isSgAssignOp(node)) { // copy the rhs lattice to the lhs lattice (as well as the entire '=' expression result)
assert(in1 && in2);
modified = in1->meetUpdate(in2);
}
} else if (isSgUnaryOp(node)) {
// as in "-a"
SgUnaryOp *xop = isSgUnaryOp(node);
varID in1_id = SgExpr2Var(xop->get_operand());
TaintLattice *in1 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in1_id));
inputs.push_back(in1);
} else if (isSgReturnStmt(node)) {
// as in "return a". The result will always be dead, so we're just doing this to get some debugging output. Most
// of our test inputs are functions, and the test examines the function's returned taintedness.
SgReturnStmt *xop = isSgReturnStmt(node);
varID in1_id = SgExpr2Var(xop->get_expression());
TaintLattice *in1 = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(in1_id));
inputs.push_back(in1);
}
// Update the result lattice (unless dead) with the inputs (unless dead) by using the meedUpdate() method. All this
// means is that the new result will be the maximum of the old result and all inputs, where "maximum" is defined such
// that "tainted" is greater than "untainted" (and both of them are greater than bottom/unknown).
for (size_t i=0; i<inputs.size(); ++i)
if (debug)
*debug <<"TaintAnalysis::transfer: input " <<(i+1) <<" is " <<lattice_info(inputs[i]) <<"\n";
if (!result && varID::isValidVarExp(node)) {
varID result_id(node); // NOTE: constructor doesn't handle all SgExpression nodes, thus the next "if"
result = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(result_id));
}
if (!result && isSgExpression(node)) {
varID result_id = SgExpr2Var(isSgExpression(node));
result = dynamic_cast<TaintLattice*>(prodLat->getVarLattice(result_id));
}
if (result) {
for (size_t i=0; i<inputs.size(); ++i) {
if (inputs[i])
modified = result->meetUpdate(inputs[i]) || modified;
}
}
if (debug)
*debug <<"TaintAnalysis::transfer: result is " <<lattice_info(result) <<(modified?" (modified)":" (not modified)") <<"\n";
return modified;
}
