Fixed memory leak in Qt GUI when adding a new symbolic debug fails. Added error messaging to inform user why it failed.

src/debugsymboltable.cpp

@@ -19,6 +19,7 @@ extern FCEUGI *GameInfo;
 
 debugSymbolTable_t  debugSymbolTable;
 
+static char dbgSymTblErrMsg[256] = {0};
 //--------------------------------------------------------------
 // debugSymbolPage_t
 //--------------------------------------------------------------
@@ -41,10 +42,12 @@ int debugSymbolPage_t::addSymbol( debugSymbol_t*sym )
 	// Check if symbol already is loaded by that name or offset
 	if ( symMap.count( sym->offset() ) )
 	{
+		snprintf( dbgSymTblErrMsg, sizeof(dbgSymTblErrMsg), "Error: symbol offset 0x%04x already has an entry on page:%i\n", sym->offset(), pageNum );
 		return -1;
 	}
 	if ( (sym->name().size() > 0) && symNameMap.count( sym->name() ) )
 	{
+		snprintf( dbgSymTblErrMsg, sizeof(dbgSymTblErrMsg), "Error: symbol name '%s' already exists on page:%i\n", sym->name().c_str(), pageNum );
 		return -1;
 	}
 
@@ -230,6 +233,8 @@ void debugSymbolPage_t::print(void)
 debugSymbolTable_t::debugSymbolTable_t(void)
 {
 	cs = new FCEU::mutex();
+
+	dbgSymTblErrMsg[0] = 0;
 }
 //--------------------------------------------------------------
 debugSymbolTable_t::~debugSymbolTable_t(void)
@@ -765,3 +770,9 @@ void debugSymbolTable_t::print(void)
 		page->print();
 	}
 }
+//--------------------------------------------------------------
+const char *debugSymbolTable_t::errorMessage(void)
+{
+	return dbgSymTblErrMsg;
+}
+//--------------------------------------------------------------

src/debugsymboltable.h

@@ -171,6 +171,8 @@ class debugSymbolTable_t
 
 		int deleteSymbolAtBankOffset( int bank, int ofs );
 
+		const char *errorMessage(void);
+
 	private:
 		std::map <int, debugSymbolPage_t*> pageMap;
 		FCEU::mutex *cs;

src/drivers/Qt/SymbolicDebug.cpp

@@ -35,6 +35,7 @@
 #include "Qt/fceuWrapper.h"
 #include "Qt/SymbolicDebug.h"
 #include "Qt/ConsoleUtilities.h"
+#include "Qt/ConsoleWindow.h"
 
 
 //--------------------------------------------------------------
@@ -826,8 +827,14 @@ int SymbolEditWindow::exec(void)
 					{
 						sym = new debugSymbol_t(a);
 
-						debugSymbolTable.addSymbolAtBankOffset( b, a, sym );
-
+						if ( debugSymbolTable.addSymbolAtBankOffset( b, a, sym ) )
+						{
+							if (consoleWindow)
+							{
+								consoleWindow->QueueErrorMsgWindow( debugSymbolTable.errorMessage() );
+							}
+							delete sym;
+						}
 						isNew = true;
 					}
 					sym->setOffset(a);
@@ -861,7 +868,14 @@ int SymbolEditWindow::exec(void)
 				sym = new debugSymbol_t( addr, nameEntry->text().toStdString().c_str(), 
 						commentEntry->toPlainText().toStdString().c_str());
 
-				debugSymbolTable.addSymbolAtBankOffset( bank, addr, sym );
+				if ( debugSymbolTable.addSymbolAtBankOffset( bank, addr, sym ) )
+				{
+					if (consoleWindow)
+					{
+						consoleWindow->QueueErrorMsgWindow( debugSymbolTable.errorMessage() );
+					}
+					delete sym;
+				}
 			}
 			else
 			{