fixed slicing problem with paramblocks where block descriptors are invalid...

fixed slicing problem with paramblocks where block descriptors are invalid after copying a derived block type to a base block value.

indra/llxuixml/llinitparam.cpp

@@ -84,8 +84,7 @@ namespace LLInitParam
 	// BaseBlock
 	//
 	BaseBlock::BaseBlock()
-	:	mChangeVersion(0),
-		mBlockDescriptor(NULL)
+	:	mChangeVersion(0)
 	{}
 
 	BaseBlock::~BaseBlock()
@@ -94,8 +93,6 @@ namespace LLInitParam
 	// called by each derived class in least to most derived order
 	void BaseBlock::init(BlockDescriptor& descriptor, BlockDescriptor& base_descriptor, size_t block_size)
 	{
-		mBlockDescriptor = &descriptor;
-
 		descriptor.mCurrentBlockPtr = this;
 		descriptor.mMaxParamOffset = block_size;
 

indra/llxuixml/llinitparam.h

@@ -480,8 +480,8 @@ namespace LLInitParam
 		bool serializeBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t(), const BaseBlock* diff_block = NULL) const;
 		bool inspectBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t()) const;
 
-		const BlockDescriptor& mostDerivedBlockDescriptor() const { return *mBlockDescriptor; }
-		BlockDescriptor& mostDerivedBlockDescriptor() { return *mBlockDescriptor; }
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
 
 		// take all provided params from other and apply to self
 		bool overwriteFrom(const BaseBlock& other)
@@ -506,8 +506,6 @@ namespace LLInitParam
 		// can be updated in getters
 		mutable S32				mChangeVersion;
 
-		BlockDescriptor*		mBlockDescriptor;	// most derived block descriptor
-
 		static BlockDescriptor& selfBlockDescriptor()
 		{
 			static BlockDescriptor sBlockDescriptor;
@@ -1313,6 +1311,9 @@ namespace LLInitParam
 			BaseBlock::setLastChangedParam(last_param, user_provided);
 		}
 
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
+
 	protected:
 		Choice()
 		:	mCurChoice(0)
@@ -1422,6 +1423,10 @@ namespace LLInitParam
 		{
 			return BaseBlock::merge(selfBlockDescriptor(), other, false);
 		}
+
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
+
 	protected:
 		Block()
 		{