GP-4347: PeLoader now pads initialized memory blocks with 0 instead of

creating an additional uninitialized block. Also improved Bytes Source
column of Memory Map.

Ghidra/Features/Base/src/main/help/help/topics/MemoryMapPlugin/Memory_Map.htm

@@ -134,10 +134,10 @@
       this property applies to Default and Overlay blocks.</P>
       
       <P><I><B>Byte Source -</B></I> Provides information about the source of the bytes in this
-      	block.  If the bytes were originally imported from a file, then this will indicate which file
+      	block. A block is made up of one or more sub-blocks. Each sub-block is listed by its type,
-      	and the offset into that file.  If the bytes are mapped to another region of memory, it will
+      	size, and other type-specific information. For example, if the bytes were originally imported 
-      	provide the address for the mapping.  Blocks may consist of regions that have different
+      	from a file, then the file name and the offset into that file is displayed. If the bytes are
-      	sources.  In that case, source information about the first several regions will be
+      	mapped to another region of memory, then the start address for the mapping will be
       	displayed.</P>
 
       <P><I><B>Source -</B></I> Description of block origination.</P>

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/MemoryMapModel.java

@@ -467,7 +467,7 @@ class MemoryMapModel extends AbstractSortedTableModel<MemoryBlock> implements Pr
 		String description = limited
 							.stream()
 							.map(info -> info.getDescription())
-							.collect(Collectors.joining(", "));
+							.collect(Collectors.joining(" | "));
 		//@formatter:on
 		if (limited != sourceInfos) {
 			description += "...";

Ghidra/Features/Base/src/main/java/ghidra/app/util/MemoryBlockUtils.java

@@ -209,7 +209,7 @@ public class MemoryBlockUtils {
 	 * @param w the write permission for the new block.
 	 * @param x the execute permission for the new block.
 	 * @param log a {@link MessageLog} for appending error messages
-	 * @return the new created block
+	 * @return the newly created block or null if the operation failed
 	 * @throws AddressOverflowException if the address 
 	 */
 	public static MemoryBlock createInitializedBlock(Program program, boolean isOverlay,
@@ -262,7 +262,7 @@ public class MemoryBlockUtils {
 	 * @param x the execute permission for the new block.
 	 * @param log a {@link MessageLog} for appending error messages
 	 * @param monitor the monitor for canceling this potentially long running operation.
-	 * @return the new created block
+	 * @return the newly created block or null if the operation failed
 	 * @throws AddressOverflowException if the address 
 	 */
 	public static MemoryBlock createInitializedBlock(Program program, boolean isOverlay,

Ghidra/Features/Base/src/main/java/ghidra/app/util/opinion/PeLoader.java

@@ -46,6 +46,7 @@ import ghidra.program.model.address.*;
 import ghidra.program.model.data.*;
 import ghidra.program.model.listing.*;
 import ghidra.program.model.mem.MemoryAccessException;
+import ghidra.program.model.mem.MemoryBlock;
 import ghidra.program.model.reloc.Relocation.Status;
 import ghidra.program.model.reloc.RelocationTable;
 import ghidra.program.model.symbol.*;
@@ -671,6 +672,7 @@ public class PeLoader extends AbstractPeDebugLoader {
 				int rawDataSize = sections[i].getSizeOfRawData();
 				int rawDataPtr = sections[i].getPointerToRawData();
 				virtualSize = sections[i].getVirtualSize();
+				MemoryBlock block = null;
 				if (rawDataSize != 0 && rawDataPtr != 0) {
 					int dataSize =
 						((rawDataSize > virtualSize && virtualSize > 0) || rawDataSize < 0)
@@ -682,8 +684,8 @@ public class PeLoader extends AbstractPeDebugLoader {
 							Msg.warn(this, "OptionalHeader.SizeOfImage < size of " +
 								sections[i].getName() + " section");
 						}
-						MemoryBlockUtils.createInitializedBlock(prog, false, sectionName, address,
+						block = MemoryBlockUtils.createInitializedBlock(prog, false, sectionName,
-							fileBytes, rawDataPtr, dataSize, "", "", r, w, x, log);
+							address, fileBytes, rawDataPtr, dataSize, "", "", r, w, x, log);
 						sectionToAddress.put(sections[i], address);
 					}
 					if (rawDataSize == virtualSize) {
@@ -711,11 +713,26 @@ public class PeLoader extends AbstractPeDebugLoader {
 				else {
 					int dataSize = (virtualSize > 0 || rawDataSize < 0) ? virtualSize : 0;
 					if (dataSize > 0) {
-						MemoryBlockUtils.createUninitializedBlock(prog, false, sectionName, address,
+						if (block != null) {
-							dataSize, "", "", r, w, x, log);
+							MemoryBlock paddingBlock =
+								MemoryBlockUtils.createInitializedBlock(prog, false, sectionName,
+									address, dataSize, "", "", r, w, x, log);
+							if (paddingBlock != null) {
+								try {
+									prog.getMemory().join(block, paddingBlock);
+								}
+								catch (Exception e) {
+									log.appendMsg(e.getMessage());
+								}
+							}
+						}
+						else {
+							MemoryBlockUtils.createUninitializedBlock(prog, false, sectionName,
+								address, dataSize, "", "", r, w, x, log);
 							sectionToAddress.putIfAbsent(sections[i], address);
 						}
 					}
+				}
 
 			}
 		}

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/BitMappedSubMemoryBlock.java

@@ -179,7 +179,7 @@ class BitMappedSubMemoryBlock extends SubMemoryBlock {
 
 	@Override
 	protected String getDescription() {
-		return "Bit Mapped: " + mappedAddress;
+		return "bitmap[0x%x, 0x%x, %s]".formatted(subBlockOffset, subBlockLength, mappedAddress);
 	}
 
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/BufferSubMemoryBlock.java

@@ -117,6 +117,6 @@ class BufferSubMemoryBlock extends SubMemoryBlock {
 
 	@Override
 	protected String getDescription() {
-		return "";
+		return "init[0x%x]".formatted(subBlockLength);
 	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/ByteMappedSubMemoryBlock.java

@@ -199,7 +199,7 @@ class ByteMappedSubMemoryBlock extends SubMemoryBlock {
 
 	@Override
 	protected String getDescription() {
-		return "Byte Mapped: " + mappedAddress + ", " + byteMappingScheme;
+		return "bytemap[0x%x, 0x%x, %s]".formatted(subBlockOffset, subBlockLength, mappedAddress);
 	}
 
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/FileBytesSubMemoryBlock.java

@@ -112,10 +112,8 @@ class FileBytesSubMemoryBlock extends SubMemoryBlock {
 
 	@Override
 	protected String getDescription() {
-		String fileName = fileBytes.getFilename();
+		return "%s[0x%x, 0x%x]".formatted(fileBytes.getFilename(),
-
+			fileBytesOffset + fileBytes.getFileOffset(), subBlockLength);
-		String hexString = Long.toHexString(fileBytesOffset + fileBytes.getFileOffset());
-		return "File: " + fileName + ": 0x" + hexString;
 	}
 
 	@Override

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/UninitializedSubMemoryBlock.java

@@ -86,7 +86,6 @@ class UninitializedSubMemoryBlock extends SubMemoryBlock {
 
 	@Override
 	protected String getDescription() {
-		return "";
+		return "uninit[0x%x]".formatted(subBlockLength);
 	}
-
 }