Revert "Remove SVFG::fromValue."

This reverts commit cfb6657.

Author: gerion0

include/Graphs/SVFG.h

@@ -173,6 +173,11 @@ class SVFG : public VFG
         return getSVFGNode(getDef(pagNode));
     }
 
+    /// Return the corresponding SVFGNodes to a given llvm::Value.
+    /// return an empty list, if the no mapping is possible
+    std::set<const SVFGNode*> fromValue(const llvm::Value* value) const;
+
+
     /// Perform statistics
     void performStat();
 

lib/Graphs/SVFG.cpp

@@ -575,6 +575,28 @@ void SVFG::dump(const std::string& file, bool simple)
     GraphPrinter::WriteGraphToFile(outs(), file, this, simple);
 }
 
+std::set<const SVFGNode*> SVFG::fromValue(const llvm::Value* value) const
+{
+    SVFIR* pag = SVFIR::getPAG();
+    std::set<const SVFGNode*> ret;
+    // search for all PAGEdges first
+    for (const PAGEdge* pagEdge : pag->getValueEdges(value))
+    {
+        PAGEdgeToStmtVFGNodeMapTy::const_iterator it = PAGEdgeToStmtVFGNodeMap.find(pagEdge);
+        if (it != PAGEdgeToStmtVFGNodeMap.end())
+        {
+            ret.emplace(it->second);
+        }
+    }
+    // add all PAGNodes
+    PAGNode* pagNode = pag->getGNode(pag->getValueNode(value));
+    if(hasDef(pagNode))
+    {
+        ret.emplace(getDefSVFGNode(pagNode));
+    }
+    return ret;
+}
+
 /**
  * Get all inter value flow edges at this indirect call site, including call and return edges.
  */