[llvm] [llvm-objcopy] Add --change-section-address (PR #98664)

[Eleanor Bonnici via llvm-commits]

================
@@ -584,6 +584,69 @@ static Expected<int64_t> parseChangeSectionLMA(StringRef ArgValue,
   return *LMAValue;
 }
 
+static Expected<SectionPatternAddressUpdate>
+parseChangeSectionAddr(StringRef ArgValue, StringRef OptionName,
+                       MatchStyle SectionMatchStyle,
+                       function_ref<Error(Error)> ErrorCallback) {
+
+  SectionPatternAddressUpdate PatternUpdate;
+
+  size_t last_i = ArgValue.find_last_of("+-=");
+  StringRef Value = ArgValue.slice(last_i + 1, StringRef::npos);
+  StringRef SectionPattern = ArgValue.slice(0, last_i);
+
+  if (last_i == StringRef::npos)
+    return createStringError(errc::invalid_argument,
+                             "bad format for " + OptionName +
+                                 ": argument value " + ArgValue +
+                                 " is invalid. See --help");
+
+  char UpdateSymbol = ArgValue[last_i];
+
+  switch (UpdateSymbol) {
+  case '+':
+    PatternUpdate.Update.Kind = AdjustKind::Add;
+    break;
+  case '-':
+    PatternUpdate.Update.Kind = AdjustKind::Subtract;
+    break;
+  case '=':
+    PatternUpdate.Update.Kind = AdjustKind::Set;
+  }
+
+  if (Value.empty()) {
+    if (UpdateSymbol == '+' || UpdateSymbol == '-')
----------------
eleanor-arm wrote:

The wording is slightly different depending on whether the action was setting the address or adjusting it. 

https://github.com/llvm/llvm-project/pull/98664