Cleanups.

- Add clarifying comment.
- Slightly adjust handling of augmentation 'P' so it also handles
  skipping LEB128-encoded values correctly.
- Remove unused code.

src/apps/debugger/dwarf/DwarfFile.cpp

@@ -234,8 +234,11 @@ struct DwarfFile::CIEAugmentation {
 		:
 		fString(NULL),
 		fFlags(0),
-		fAddressEncoding(0)
+		fAddressEncoding(CFI_ADDRESS_FORMAT_ABSOLUTE)
 	{
+		// we default to absolute address format since that corresponds
+		// to the DWARF standard for .debug_frame. In gcc's case, however,
+		// .eh_frame will generally override that via augmentation 'R'
 	}
 
 	void Init(DataReader& dataReader)
@@ -270,11 +273,12 @@ struct DwarfFile::CIEAugmentation {
 						break;
 					case 'P':
 					{
-						char personalityEncoding = dataReader.Read<char>(0);
-						uint8 addressSize = EncodedAddressSize(
-							personalityEncoding, NULL);
-						dataReader.Skip(addressSize);
-						remaining -= addressSize + 1;
+						char tempEncoding = fAddressEncoding;
+						fAddressEncoding = dataReader.Read<char>(0);
+						off_t offset = dataReader.Offset();
+						ReadEncodedAddress(dataReader, NULL, NULL, true);
+						fAddressEncoding = tempEncoding;
+						remaining -= dataReader.Offset() - offset + 1;
  						break;
 					}
 					case 'R':
@@ -370,24 +374,6 @@ struct DwarfFile::CIEAugmentation {
 		return 0;
 	}
 
-	int8 EncodedAddressSize(char encoding, CompilationUnit* unit) const
-	{
-		switch (encoding & 0x07) {
-			case CFI_ADDRESS_FORMAT_ABSOLUTE:
-				return unit->AddressSize();
-			case CFI_ADDRESS_FORMAT_UNSIGNED_16:
-				return 2;
-			case CFI_ADDRESS_FORMAT_UNSIGNED_32:
-				return 4;
-			case CFI_ADDRESS_FORMAT_UNSIGNED_64:
-				return 8;
-		}
-
-		// TODO: gcc doesn't (currently) actually generate LEB128-formatted
-		// addresses. If that changes, we'll need to handle them accordingly
-		return 0;
-	}
-
 	uint8 FDEAddressType() const
 	{
 		return fAddressEncoding & 0x70;