[llvm] Modify llvm-gsymutil to ignore invalid file indexes. (PR #70876)

[Alexander Yermolovich via llvm-commits]

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@@ -272,14 +272,24 @@ static void parseInlineInfo(GsymCreator &Gsym, raw_ostream *Log, CUInfo &CUI,
 
     if (auto NameIndex = getQualifiedNameIndex(Die, CUI.Language, Gsym))
       II.Name = *NameIndex;
-    II.CallFile = CUI.DWARFToGSYMFileIndex(
-        Gsym, dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_file), 0));
-    II.CallLine = dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_line), 0);
-    // parse all children and append to parent
-    for (DWARFDie ChildDie : Die.children())
-      parseInlineInfo(Gsym, Log, CUI, ChildDie, Depth + 1, FI, II,
-                      AllInlineRanges, WarnIfEmpty);
-    Parent.Children.emplace_back(std::move(II));
+    const uint64_t DwarfFileIdx =
+        dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_file), UINT32_MAX);
+    std::optional<uint32_t> OptGSymFileIdx =
+        CUI.DWARFToGSYMFileIndex(Gsym, DwarfFileIdx);
+    if (OptGSymFileIdx) {
+      II.CallFile = OptGSymFileIdx.value();
+      II.CallLine = dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_line), 0);
+      // parse all children and append to parent
+      for (DWARFDie ChildDie : Die.children())
+        parseInlineInfo(Gsym, Log, CUI, ChildDie, Depth + 1, FI, II,
+                        AllInlineRanges, WarnIfEmpty);
+      Parent.Children.emplace_back(std::move(II));
+    } else if (Log) {
+      *Log << "error: inlined function DIE at " << HEX32(Die.getOffset())
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ayermolo wrote:

Can this be null?

https://github.com/llvm/llvm-project/pull/70876