Introduced system for automatic clearing of block global variables (VM_TRACE'd)

ndb/src/kernel/vm/SimulatedBlock.cpp:
  Introduced automatic clearing of block global variables
ndb/src/kernel/vm/SimulatedBlock.hpp:
  Introduced automatic clearing of block global variables

ndb/src/kernel/vm/SimulatedBlock.cpp

@@ -104,6 +104,11 @@ SimulatedBlock::SimulatedBlock(BlockNumber blockNumber,
   UpgradeStartup::installEXEC(this);
 
   CLEAR_ERROR_INSERT_VALUE;
+
+#ifdef VM_TRACE
+  m_global_variables = new Ptr<void> * [1];
+  m_global_variables[0] = 0;
+#endif
 }
 
 SimulatedBlock::~SimulatedBlock()
@@ -112,6 +117,10 @@ SimulatedBlock::~SimulatedBlock()
 #ifdef VM_TRACE_TIME
   printTimes(stdout);
 #endif
+
+#ifdef VM_TRACE
+  delete [] m_global_variables;
+#endif
 }
 
 void 
@@ -1771,3 +1780,25 @@ SimulatedBlock::execUPGRADE(Signal* signal){
     break;
   }
 }
+
+#ifdef VM_TRACE
+void
+SimulatedBlock::clear_global_variables(){
+  Ptr<void> ** tmp = m_global_variables;
+  while(* tmp != 0){
+    (* tmp)->i = RNIL;
+    (* tmp)->p = 0;
+    tmp++;
+  }
+}
+
+void
+SimulatedBlock::init_globals_list(void ** tmp, size_t cnt){
+  m_global_variables = new Ptr<void> * [cnt+1];
+  for(size_t i = 0; i<cnt; i++){
+    m_global_variables[i] = (Ptr<void>*)tmp[i];
+  }
+  m_global_variables[cnt] = 0;
+}
+
+#endif

ndb/src/kernel/vm/SimulatedBlock.hpp

@@ -96,7 +96,7 @@ protected:
    * Handling of execFunctions
    */
   typedef void (SimulatedBlock::* ExecFunction)(Signal* signal);
-  void addRecSignalImpl(GlobalSignalNumber g, ExecFunction fun, bool f = false);
+  void addRecSignalImpl(GlobalSignalNumber g, ExecFunction fun, bool f =false);
   void installSimulatedBlockFunctions();
   ExecFunction theExecArray[MAX_GSN+1];
 public:
@@ -447,6 +447,12 @@ public:
   } m_timeTrace[MAX_GSN+1];
   Uint32 m_currentGsn;
 #endif
+
+#ifdef VM_TRACE
+  Ptr<void> **m_global_variables;
+  void clear_global_variables();
+  void init_globals_list(void ** tmp, size_t cnt);
+#endif
 };
 
 inline 
@@ -454,6 +460,9 @@ void
 SimulatedBlock::executeFunction(GlobalSignalNumber gsn, Signal* signal){
   ExecFunction f = theExecArray[gsn];
   if(gsn <= MAX_GSN && f != 0){
+#ifdef VM_TRACE
+    clear_global_variables();
+#endif
     (this->*f)(signal);
     return;
   }
@@ -679,6 +688,5 @@ BLOCK::addRecSignal(GlobalSignalNumber gsn, ExecSignalLocal f, bool force){ \
   addRecSignalImpl(gsn, (ExecFunction)f, force);\
 }
 
-
 #endif