dvmemory: redo 47377bf

Author: happppp

src/emu/debug/debugvw.h

@@ -277,10 +277,10 @@ class debug_view_expression
 	void set_context(symbol_table *context);
 	void set_default_base(int base) { m_parsed.set_default_base(base); }
 
-private:
-	// internal helpers
+	// helpers
 	bool recompute();
 
+private:
 	// internal state
 	running_machine &   m_machine;              // reference to the machine
 	bool                m_dirty;                // true if the expression needs to be re-evaluated

src/emu/debug/dvmemory.cpp

@@ -717,18 +717,11 @@ bool debug_view_memory::needs_recompute()
 {
 	bool recompute = m_recompute;
 
-	offs_t val = m_expression.value();
-	// checks if evaluated expression value has changed since last time
-	if (val != m_expression_computed)
-	{
-		m_expression_computed = val;
-		m_expression.mark_dirty();
-	}
-
 	// handle expression changes
-	if (m_expression.dirty())
+	if (m_expression.recompute())
 	{
 		const debug_view_memory_source &source = downcast<const debug_view_memory_source &>(*m_source);
+		offs_t val = m_expression.last_value();
 		if (source.m_memintf)
 		{
 			const address_space_config *config = m_no_translation ? source.m_memintf->space_config(source.m_spacenum) : source.m_memintf->logical_space_config(source.m_spacenum);

src/emu/debug/dvmemory.h

@@ -134,7 +134,6 @@ class debug_view_memory : public debug_view
 
 	// internal state
 	debug_view_expression m_expression;         // expression describing the start address
-	offs_t              m_expression_computed;  // latest value of computed expression
 	u32                 m_chunks_per_row;       // number of chunks displayed per line
 	u8                  m_bytes_per_chunk;      // bytes per chunk
 	u8                  m_steps_per_chunk;      // bytes per chunk