[llvm] [Object] Parsing and dumping of SFrame FDEs (PR #149828)

[James Henderson via llvm-commits]

================
@@ -6433,6 +6436,86 @@ template <typename ELFT> void ELFDumper<ELFT>::printMemtag() {
   printMemtag(DynamicEntries, AndroidNoteDesc, GlobalDescriptors);
 }
 
+template <typename ELFT>
+void ELFDumper<ELFT>::printSFrameHeader(
+    const SFrameParser<ELFT::Endianness> &Parser) {
+  DictScope HeaderScope(W, "Header");
+
+  const sframe::Preamble<ELFT::Endianness> &Preamble = Parser.getPreamble();
+  W.printHex("Magic", Preamble.Magic.value());
+  W.printEnum("Version", Preamble.Version.value(), sframe::getVersions());
+  W.printFlags("Flags", Preamble.Flags.value(), sframe::getFlags());
+
+  const sframe::Header<ELFT::Endianness> &Header = Parser.getHeader();
+  W.printEnum("ABI", Header.ABIArch.value(), sframe::getABIs());
+
+  W.printNumber(("CFA fixed FP offset" +
+                 Twine(Parser.usesFixedFPOffset() ? "" : " (unused)"))
+                    .str(),
+                Header.CFAFixedFPOffset.value());
+
+  W.printNumber(("CFA fixed RA offset" +
+                 Twine(Parser.usesFixedRAOffset() ? "" : " (unused)"))
+                    .str(),
+                Header.CFAFixedRAOffset.value());
+
+  W.printNumber("Auxiliary header length", Header.AuxHdrLen.value());
+  W.printNumber("Num FDEs", Header.NumFDEs.value());
+  W.printNumber("Num FREs", Header.NumFREs.value());
+  W.printNumber("FRE subsection length", Header.FRELen.value());
+  W.printNumber("FDE subsection offset", Header.FDEOff.value());
+  W.printNumber("FRE subsection offset", Header.FREOff.value());
+
+  if (Expected<ArrayRef<uint8_t>> Aux = Parser.getAuxHeader())
+    W.printHexList("Auxiliary header", *Aux);
+  else
+    reportWarning(Aux.takeError(), FileName);
+}
+
+template <typename ELFT>
+void ELFDumper<ELFT>::printSFrameFDEs(
+    const SFrameParser<ELFT::Endianness> &Parser) {
+  typename SFrameParser<ELFT::Endianness>::FDERange FDEs;
+  if (Error Err = Parser.fdes().moveInto(FDEs)) {
+    reportWarning(std::move(Err), FileName);
+    return;
+  }
+
+  ListScope IndexScope(W, "Function Index");
+  for (auto It = FDEs.begin(); It != FDEs.end(); ++It) {
+    DictScope FDEScope(
+        W,
+        formatv("FuncDescEntry [{0}]", std::distance(FDEs.begin(), It)).str());
+
+    W.printHex("PC", Parser.getAbsoluteStartAddress(It));
+    W.printHex("Size", It->Size);
+    W.printHex("Start FRE Offset", It->StartFREOff);
+    W.printNumber("Num FREs", It->NumFREs);
+
+    W.printHex("Info", It->Info);
+    W.printEnum("FRE Type", It->getFREType(), sframe::getFRETypes());
+    W.printEnum("FDE Type", It->getFDEType(), sframe::getFDETypes());
+    switch (Parser.getHeader().ABIArch) {
+    case sframe::ABI::AArch64EndianBig:
+    case sframe::ABI::AArch64EndianLittle:
+      W.printEnum("PAuth Key", sframe::AArch64PAuthKey(It->getPAuthKey()),
+                  sframe::getAArch64PAuthKeys());
+      break;
+    default:
+      W.printNumber("PAuth Key (unused)", It->getPAuthKey());
+      break;
+    }
----------------
jh7370 wrote:

Looks good, thanks.

https://github.com/llvm/llvm-project/pull/149828