bool FunctionStaticSlicer::updateRCSC(
PostDominanceFrontier::DomSetType::const_iterator start,
PostDominanceFrontier::DomSetType::const_iterator end) {
bool changed = false;
#ifdef DEBUG_RC
errs() << __func__ << " ============ BEG\n";
#endif
for (; start != end; start++) {
const BasicBlock *BB = *start;
const Instruction &i = BB->back();
InsInfo *ii = getInsInfo(&i);
/* SC = BC \cup ... */
#ifdef DEBUG_SLICING
errs() << "XXXXXXXXXXXXXX " << BB->getName() << " ";
i.print(errs());
errs() << '\n';
#endif
ii->deslice();
/* RC = ... \cup \cup(b \in BC) RB */
for (ValSet::const_iterator II = ii->REF_begin(), EE = ii->REF_end();
II != EE; II++)
if (ii->addRC(*II)) {
changed = true;
#ifdef DEBUG_RC
errs() << " added " << (*II)->getName() << "\n";
#endif
}
}
#ifdef DEBUG_RC
errs() << __func__ << " ============ END: changed=" << changed << "\n";
#endif
return changed;
}
/*
* j is predecessor of i
* SC(i)={i| REF(i) \cap RC(j) \neq \emptyset}
* Statement i should be in slice if it uses a relevant variable
*/
void FwdFunctionStaticSlicer::computeSCi(const Instruction *i, const Instruction *j) {
InsInfo *insInfoi = getInsInfo(i), *insInfoj = getInsInfo(j);
#ifdef DEBUG_SLICE
errs() << "\n\ti ==>\t";
i->print(errs());
errs() << "\n\tj ==>\t";
j->print(errs());
#endif
bool isect_nonempty = false;
for (ValSet::const_iterator I = insInfoi->REF_begin(),
E = insInfoi->REF_end(); I != E && !isect_nonempty; I++) {
const Pointee &REFi = *I;
for (ValSet::const_iterator II = insInfoj->RC_begin(),
EE = insInfoj->RC_end(); II != EE; II++) {
if(Helper::checkValid(REFi, *II)) {
#ifdef DEBUG_SLICE
errs() << "\n\t\t";
REFi.first->print(errs());
errs() << "\t\t";
II->first->print(errs());
#endif
if (AA->isMustAlias(REFi.first, II->first)) {
isect_nonempty = true;
break;
}
}
}
}
if (isect_nonempty) {
insInfoi->deslice();
#ifdef DEBUG_SLICING
errs() << "\n\tXXXXXXXXXXXXXY ";
i->print(errs());
errs() << '\n';
#endif
}
}