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//===- GraphChecker.cpp - Assert that various graph properties hold -------===//
//
// This pass is used to test DSA with regression tests. It can be used to check
// that certain graph properties hold, such as two nodes being disjoint, whether
// or not a node is collapsed, etc. These are the command line arguments that
// it supports:
//
// --dsgc-dsapass={local,bu,td} - Specify what flavor of graph to check
// --dsgc-abort-if-any-collapsed - Abort if any collapsed nodes are found
// --dsgc-abort-if-collapsed=<list> - Abort if a node pointed to by an SSA
// value with name in <list> is collapsed
// --dsgc-abort-if-merged=<list> - Abort if any of the named SSA values
// point to the same node.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DataStructure.h"
#include "llvm/Analysis/DSGraph.h"
#include "Support/CommandLine.h"
#include "llvm/Value.h"
#include <set>
namespace {
enum DSPass { local, bu, td };
cl::opt<DSPass>
DSPass("dsgc-dspass", cl::Hidden,
cl::desc("Specify which DSA pass the -datastructure-gc pass should use"),
cl::values(clEnumVal(local, "Local pass"),
clEnumVal(bu, "Bottom-up pass"),
clEnumVal(td, "Top-down pass"), 0), cl::init(local));
cl::opt<bool>
AbortIfAnyCollapsed("dsgc-abort-if-any-collapsed", cl::Hidden,
cl::desc("Abort if any collapsed nodes are found"));
cl::list<std::string>
AbortIfCollapsed("dsgc-abort-if-collapsed", cl::Hidden, cl::CommaSeparated,
cl::desc("Abort if any of the named symbols is collapsed"));
cl::list<std::string>
AbortIfMerged("dsgc-abort-if-merged", cl::Hidden, cl::CommaSeparated,
cl::desc("Abort if any of the named symbols are merged together"));
struct DSGC : public FunctionPass {
DSGC();
bool doFinalization(Module &M);
bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
switch (DSPass) {
case local: AU.addRequired<LocalDataStructures>(); break;
case bu: AU.addRequired<BUDataStructures>(); break;
case td: AU.addRequired<TDDataStructures>(); break;
}
AU.setPreservesAll();
}
private:
void verify(const DSGraph &G);
};
RegisterAnalysis<DSGC> X("datastructure-gc", "DSA Graph Checking Pass");
}
DSGC::DSGC() {
if (!AbortIfAnyCollapsed && AbortIfCollapsed.empty() &&
AbortIfMerged.empty()) {
std::cerr << "The -datastructure-gc is useless if you don't specify any"
" -dsgc-* options. See the -help-hidden output for a list.\n";
abort();
}
}
/// doFinalization - Verify that the globals graph is in good shape...
///
bool DSGC::doFinalization(Module &M) {
switch (DSPass) {
case local:verify(getAnalysis<LocalDataStructures>().getGlobalsGraph());break;
case bu: verify(getAnalysis<BUDataStructures>().getGlobalsGraph()); break;
case td: verify(getAnalysis<TDDataStructures>().getGlobalsGraph()); break;
}
return false;
}
/// runOnFunction - Get the DSGraph for this function and verify that it is ok.
///
bool DSGC::runOnFunction(Function &F) {
switch (DSPass) {
case local: verify(getAnalysis<LocalDataStructures>().getDSGraph(F)); break;
case bu: verify(getAnalysis<BUDataStructures>().getDSGraph(F)); break;
case td: verify(getAnalysis<TDDataStructures>().getDSGraph(F)); break;
}
return false;
}
/// verify - This is the function which checks to make sure that all of the
/// invariants established on the command line are true.
///
void DSGC::verify(const DSGraph &G) {
// Loop over all of the nodes, checking to see if any are collapsed...
if (AbortIfAnyCollapsed) {
const std::vector<DSNode*> &Nodes = G.getNodes();
for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
if (Nodes[i]->isNodeCompletelyFolded()) {
std::cerr << "Node is collapsed: ";
Nodes[i]->print(std::cerr, &G);
abort();
}
}
if (!AbortIfCollapsed.empty() || !AbortIfMerged.empty()) {
// Convert from a list to a set, because we don't have cl::set's yet. FIXME
std::set<std::string> AbortIfCollapsedS(AbortIfCollapsed.begin(),
AbortIfCollapsed.end());
std::set<std::string> AbortIfMerged(AbortIfMerged.begin(),
AbortIfMerged.end());
// Now we loop over all of the scalars, checking to see if any are collapsed
// that are not supposed to be, or if any are merged together.
const DSGraph::ScalarMapTy &SM = G.getScalarMap();
std::map<DSNode*, std::string> AbortIfMergedNodes;
for (DSGraph::ScalarMapTy::const_iterator I = SM.begin(), E = SM.end();
I != E; ++I)
if (I->first->hasName() && I->second.getNode()) {
DSNode *N = I->second.getNode();
// Verify it is not collapsed if it is not supposed to be...
if (N->isNodeCompletelyFolded() &&
AbortIfCollapsedS.count(I->first->getName())) {
std::cerr << "Node for value '%" << I->first->getName()
<< "' is collapsed: ";
N->print(std::cerr, &G);
abort();
}
// Verify that it is not merged if it is not supposed to be...
if (AbortIfMerged.count(I->first->getName())) {
if (AbortIfMergedNodes.count(N)) {
std::cerr << "Nodes for values '%" << I->first->getName()
<< "' and '%" << AbortIfMergedNodes[N] << "' is merged: ";
N->print(std::cerr, &G);
abort();
}
AbortIfMergedNodes[N] = I->first->getName();
}
}
}
}
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