[llvm] [llvm-objdump] Implement decoding auxiliary header for xcoff with llvm-objdump --private-headers (PR #105682)

[James Henderson via llvm-commits]

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@@ -67,6 +75,179 @@ void XCOFFDumper::printStrHex(StringRef Name, StringRef Str, uint64_t Value) {
          << ")\n";
 }
 
+void XCOFFDumper::printBinary(StringRef Name, ArrayRef<uint8_t> B) {
+  unsigned OrgWidth = getWidth();
+  setWidth(0);
+  outs() << formatName(Name) << " (" << format_bytes(B) << ")\n";
+  setWidth(OrgWidth);
+}
+
+void XCOFFDumper::printAuxiliaryHeader() {
+  setWidth(36);
+  if (Obj.is64Bit())
+    printAuxiliaryHeader(Obj.auxiliaryHeader64());
+  else
+    printAuxiliaryHeader(Obj.auxiliaryHeader32());
+}
+
+enum PrintStyle { Hex, Number };
+template <typename T, typename V>
+static void printAuxMemberHelper(PrintStyle Style, const char *MemberName,
+                                 const T &Member, const V *AuxHeader,
+                                 uint16_t AuxSize, uint16_t &PartialFieldOffset,
+                                 const char *&PartialFieldName,
+                                 XCOFFDumper *Dumper) {
+  ptrdiff_t Offset = reinterpret_cast<const char *>(&Member) -
+                     reinterpret_cast<const char *>(AuxHeader);
+  if (Offset + sizeof(Member) <= AuxSize)
+    Style == Hex ? Dumper->printHex(MemberName, Member)
+                 : Dumper->printNumber(MemberName, Member);
+  else if (Offset < AuxSize) {
+    PartialFieldOffset = Offset;
+    PartialFieldName = MemberName;
+  }
+}
+
+template <class T>
+void checkAndPrintAuxHeaderParseError(const char *PartialFieldName,
+                                      uint16_t PartialFieldOffset,
+                                      uint16_t AuxSize, T &AuxHeader,
+                                      XCOFFDumper *Dumper) {
+  if (PartialFieldOffset < AuxSize) {
+    Dumper->reportUniqueWarning(Twine("only partial field for ") +
+                                PartialFieldName + " at offset (" +
+                                Twine(PartialFieldOffset) + ")");
+    Dumper->printBinary(
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jh7370 wrote:

You are presumably aware that this will print to stdout, whereas the warning will be printed to stderr, so they may not line up together?

https://github.com/llvm/llvm-project/pull/105682