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MetadataCrawler.cpp
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#include "MetadataCrawler.hpp"
#include <sstream>
void MetadataCrawler::traverseMetadata(MDNode *mdn, MDTraversal *traversal) {
if (mdn == 0) {
return;
}
if (visited.count(mdn) > 0) {
return;
} else {
visited.insert(mdn);
}
unsigned int n_op = mdn->getNumOperands();
traversal->traverse(mdn);
for (int i = 0; i < n_op; i++) {
if (mdn->getOperand(i)) {
if (MDNode *child = dyn_cast<MDNode>(mdn->getOperand(i))) {
traverseMetadata(child, traversal);
}
}
}
}
void MetadataCrawler::crawlModule(Module &m) {
NamedMDNode *nmd = m.getNamedMetadata("llvm.dbg.cu");
crawlNMD(nmd, &typedefTraversal);
crawlAllInstructions(m, &typedefTraversal);
visited.clear();
crawlNMD(nmd, &fieldNameTraversal);
crawlAllInstructions(m, &fieldNameTraversal);
}
void MetadataCrawler::crawlNMD(NamedMDNode *nmd, MDTraversal *mdt) {
if (nmd == NULL) {
return;
}
unsigned int n_op = nmd->getNumOperands();
for (int i = 0; i < n_op; i++) {
if (nmd->getOperand(i)) {
if (MDNode *child = dyn_cast<MDNode>(nmd->getOperand(i))) {
traverseMetadata(child, mdt);
}
}
}
}
void MetadataCrawler::crawlAllInstructions(Module &m, MDTraversal *mdt) {
for (Function &f : m) {
for (BasicBlock &b : f) {
for (Instruction &in : b) {
if (CallInst* CI = dyn_cast<CallInst>(&in)){
if(Function *F = CI->getCalledFunction()){
if(F->getName().startswith("llvm.")){
for(unsigned i = 0, e = CI->getNumOperands(); i!=e; ++i){
if(MDNode *N = dyn_cast_or_null<MDNode>(CI->getOperand(i))){
traverseMetadata(N, mdt);
}
}
}
}
}
SmallVector< std::pair< unsigned, MDNode * >, 4> mdvect;
in.getAllMetadata(mdvect);
for (int i = 0; i < mdvect.size(); i++) {
traverseMetadata(mdvect[i].second, mdt);
}
}
}
}
}
void TypedefTraversal::traverse(MDNode *mdn) {
if (MDNode *dit = dyn_cast<MDNode>(mdn)) {
if ( mdn->getNumOperands() > 0) {
if (mdn->getOperand(0)){
if (ConstantInt *civ = dyn_cast<ConstantInt>(mdn->getOperand(0))) {
unsigned int tag = civ->getSExtValue();
if (CHECK_TAG(tag, llvm::dwarf::DW_TAG_typedef)) {
if (mdn->getNumOperands() > 9) {
MDString *mds;
if ((mdn->getOperand(3)) && (mds = dyn_cast<MDString>(mdn->getOperand(3)))) {
string tdefname(mds->getString().str());
MDNode *structptr;
if (mdn->getOperand(9) && (structptr = dyn_cast<MDNode>(mdn->getOperand(9)))) {
if (mdc->typedefMap.count(structptr) == 0) {
mdc->typedefMap[structptr] = tdefname;
}
}
} else { // has no name
MDNode *structptr;
if ((mdn->getOperand(9)) && (structptr = dyn_cast<MDNode>(mdn->getOperand(9)))) {
if (mdc->typedefMap.count(structptr) == 0) {
ostringstream oss;
string tdefname = oss.str();
mdc->typedefMap[structptr] = tdefname;
}
}
}
}
}
}
}
}
}
}
void FieldNameTraversal::traverse(MDNode *mdn) {
if (MDNode *dit = dyn_cast<MDNode>(mdn)) {
if ( mdn->getNumOperands() > 0) {
if (mdn->getOperand(0)){
if (ConstantInt *civ = dyn_cast<ConstantInt>(mdn->getOperand(0))) {
unsigned int tag = civ->getSExtValue();
if (CHECK_TAG(tag, llvm::dwarf::DW_TAG_class_type) || CHECK_TAG(tag, llvm::dwarf::DW_TAG_structure_type)) {
#ifdef DEBUG_PRINT
if (CHECK_TAG(tag, llvm::dwarf::DW_TAG_class_type)) {
cerr << "Class type!" <<endl;
} else {
cerr << "Struct type!" <<endl;
}
#endif
if ((mdn->getNumOperands() > 3) && (mdn->getOperand(3))) {
StringRef className = mdn->getOperand(3)->getName();
if (className.str() == "") {
if (mdc->typedefMap.count(mdn)) {
className = StringRef(mdc->typedefMap[mdn]);
} else if ((mdn->getNumOperands() > 14) && (mdn->getOperand(14))) {
string dmangleClass = demangle(mdn->getOperand(14)->getName().str().c_str());
if (dmangleClass.find("typeinfo name for ") != string::npos) {
dmangleClass.erase(0, strlen("typeinfo name for "));
}
className = StringRef(dmangleClass);
#ifdef DEBUG_PRINT
cerr << "cname14 " << className.str() << endl;
#endif
} else {
className = StringRef("<unknown>");
}
}
if (mdn->getNumOperands() > 10) {
if (mdn->getOperand(10)) {
if (MDNode *fields = dyn_cast<MDNode>(mdn->getOperand(10))) {
string sClassName(className.str());
mdc->getFields(sClassName, fields);
}
}
}
}
}
}
}
}
}
}
void MetadataCrawler::getFields(string className, MDNode *fields) {
unsigned int n_op = fields->getNumOperands();
for (int i = 0; i < n_op; i++) {
if (fields->getOperand(i)) {
if (MDNode *f = dyn_cast<MDNode>(fields->getOperand(i))) {
string fieldName;
if ((f->getNumOperands() > 3) && (f->getOperand(3))) {
fieldName = f->getOperand(3)->getName().str();
} else {
fieldName = "unknown";
}
fieldMap[className].push_back(fieldName);
//cerr << className << "." << fieldName << endl;
}
}
}
}
string MetadataCrawler::getFieldName(string structName, int fieldIdx) {
if (fieldMap.count(structName) > 0) {
if (fieldIdx >= fieldMap[structName].size()) {
return "unknown";
} else {
return fieldMap[structName].at(fieldIdx);
}
}
return "NA";
}