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[analyzer] Backport performace regression fix #89725

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Apr 25, 2024
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[analyzer] Backport performace regression fix #89725

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14 changes: 6 additions & 8 deletions clang/lib/StaticAnalyzer/Checkers/Taint.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -216,21 +216,17 @@ std::vector<SymbolRef> taint::getTaintedSymbolsImpl(ProgramStateRef State,
std::vector<SymbolRef> TaintedSymbols;
if (!Reg)
return TaintedSymbols;
// Element region (array element) is tainted if either the base or the offset
// are tainted.

// Element region (array element) is tainted if the offset is tainted.
if (const ElementRegion *ER = dyn_cast<ElementRegion>(Reg)) {
std::vector<SymbolRef> TaintedIndex =
getTaintedSymbolsImpl(State, ER->getIndex(), K, returnFirstOnly);
llvm::append_range(TaintedSymbols, TaintedIndex);
if (returnFirstOnly && !TaintedSymbols.empty())
return TaintedSymbols; // return early if needed
std::vector<SymbolRef> TaintedSuperRegion =
getTaintedSymbolsImpl(State, ER->getSuperRegion(), K, returnFirstOnly);
llvm::append_range(TaintedSymbols, TaintedSuperRegion);
if (returnFirstOnly && !TaintedSymbols.empty())
return TaintedSymbols; // return early if needed
}

// Symbolic region is tainted if the corresponding symbol is tainted.
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(Reg)) {
std::vector<SymbolRef> TaintedRegions =
getTaintedSymbolsImpl(State, SR->getSymbol(), K, returnFirstOnly);
Expand All @@ -239,6 +235,8 @@ std::vector<SymbolRef> taint::getTaintedSymbolsImpl(ProgramStateRef State,
return TaintedSymbols; // return early if needed
}

// Any subregion (including Element and Symbolic regions) is tainted if its
// super-region is tainted.
if (const SubRegion *ER = dyn_cast<SubRegion>(Reg)) {
std::vector<SymbolRef> TaintedSubRegions =
getTaintedSymbolsImpl(State, ER->getSuperRegion(), K, returnFirstOnly);
Expand Down Expand Up @@ -318,4 +316,4 @@ std::vector<SymbolRef> taint::getTaintedSymbolsImpl(ProgramStateRef State,
}
}
return TaintedSymbols;
}
}
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