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[llvm-nm] Improve performance while faking symbols from function starts #162755

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Merged
merged 3 commits into from
Oct 12, 2025
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[llvm-nm] Improve performance while faking symbols from function starts #162755

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[llvm-nm] Improve performance while faking symbols from function starts
drodriguez Oct 10, 2025
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drodriguez Oct 10, 2025
65815a4
Add explanatory comment about relation between FoundFns and SymbolLis…
drodriguez Oct 10, 2025
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15 changes: 7 additions & 8 deletions llvm/tools/llvm-nm/llvm-nm.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/BinaryFormat/MachO.h"
Expand Down Expand Up @@ -1615,15 +1616,13 @@ static void dumpSymbolsFromDLInfoMachO(MachOObjectFile &MachO,
}
// See if these addresses are already in the symbol table.
unsigned FunctionStartsAdded = 0;
SmallSet<uint64_t, 32> SymbolAddresses;
for (const auto &S : SymbolList)
SymbolAddresses.insert(S.Address);
for (uint64_t f = 0; f < FoundFns.size(); f++) {
bool found = false;
for (unsigned J = 0; J < SymbolList.size() && !found; ++J) {
if (SymbolList[J].Address == FoundFns[f] + BaseSegmentAddress)
found = true;
}
// See this address is not already in the symbol table fake up an
// nlist for it.
if (!found) {
// See if this address is already in the symbol table, otherwise fake up
// an nlist for it.
if (!SymbolAddresses.contains(FoundFns[f] + BaseSegmentAddress)) {
NMSymbol F = {};
F.Name = "<redacted function X>";
F.Address = FoundFns[f] + BaseSegmentAddress;
Expand Down