dead code: fix for entry statements, improve perfomance

sapfor/experts/Sapfor_2017/_src/Sapfor.cpp

@@ -1028,6 +1028,7 @@ static bool runAnalysis(SgProject &project, const int curr_regime, const bool ne
         {
             auto funcsForFile = getObjectForFileFromMap(file_name, allFuncInfo);
             for (auto& func : funcsForFile)
+                if(func->funcPointer->variant() != ENTRY_STAT)
                     removeDeadCode(func->funcPointer, allFuncInfo, commonBlocks);
         }
         else if (curr_regime == TEST_PASS)

sapfor/experts/Sapfor_2017/_src/Transformations/dead_code.cpp

@@ -228,7 +228,9 @@ public:
             updated |= updateNextNotEmpty();
 
         updated |= updateJumpStatus();
-        updated |= this->forwardData({ });
+
+        if(updated)
+            this->forwardData({ });
 
         return updated;
     }
@@ -316,6 +318,7 @@ public:
     {
         setBlock(block);
         useful.resize(block->getInstructions().size(), false);
+        this->forwardData({ });
     }
     
     const vector<bool>& getResult() { return useful; }
@@ -371,7 +374,8 @@ void removeDeadCode(SgStatement* func,
     set<SAPFOR::BasicBlock*> reachable;
 
     for (auto b : cfg_pair.second)
-        if(b->getInstructions().front()->isHeader())
+        if(b->getInstructions().front()->isHeader() || 
+           b->getInstructions().front()->getInstruction()->getOperation() == SAPFOR::CFG_OP::ENTRY)
             reachable.insert(b);
 
     set<SAPFOR::BasicBlock*> worklist = reachable;