[llvm] [llvm-objcopy] Add change-section-lma *+/-offset (PR #95431)

[James Henderson via llvm-commits]

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@@ -552,6 +552,33 @@ static Error loadNewSectionData(StringRef ArgValue, StringRef OptionName,
   return Error::success();
 }
 
+static Expected<int64_t> parseAdjustSectionLMA(StringRef ArgValue,
+                                               StringRef OptionName) {
+  StringRef StringValue;
+  if (ArgValue.starts_with("*+")) {
+    StringValue = ArgValue.slice(2, StringRef::npos);
+  } else if (ArgValue.starts_with("*-")) {
+    StringValue = ArgValue.slice(1, StringRef::npos);
+  } else {
+    return createStringError(errc::invalid_argument,
+                             "bad format for " + OptionName +
+                                 ": it is required that all sections "
+                                 "are either incremented, or decremented at "
+                                 "the same time; use *+val, "
+                                 "or *-val");
+  }
+  if (StringValue.empty())
+    return createStringError(errc::invalid_argument,
+                             "bad format for " + OptionName +
+                                 ": missing offset of LMA");
+
+  auto SLMAV = getAsInteger<int64_t>(StringValue);
----------------
jh7370 wrote:

I have no idea what `SLMAV` is supposed to mean. Please don't abbreviate variable names unnecessarily.

https://github.com/llvm/llvm-project/pull/95431