[analyzer] Move predecessor into the NodeBuilder context.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142454 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h

@@ -48,7 +48,7 @@ public:
       Location(loc),
       ST(st),
       size(Dst.size()),
-      Ctx(builder.C.Eng, builder.getBlock()),
+      Ctx(builder.C.Eng, builder.getBlock(), pred),
       NB(builder),
       respondsToCallback(respondsToCB) {
     assert(!(ST && ST != Pred->getState()));

include/clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h

@@ -171,8 +171,9 @@ public:
 struct NodeBuilderContext {
   CoreEngine &Eng;
   const CFGBlock *Block;
-  NodeBuilderContext(CoreEngine &E, const CFGBlock *B)
-    : Eng(E), Block(B) { assert(B); }
+  ExplodedNode *ContextPred;
+  NodeBuilderContext(CoreEngine &E, const CFGBlock *B, ExplodedNode *N)
+    : Eng(E), Block(B), ContextPred(N) { assert(B); assert(!N->isSink()); }
 };
 
 /// This is the simplest builder which generates nodes in the ExplodedGraph.
@@ -219,17 +220,15 @@ protected:
                                  bool MarkAsSink = false);
 
 public:
-  NodeBuilder(ExplodedNode *N, NodeBuilderContext &Ctx, bool F = true)
-    : BuilderPred(N), C(Ctx), Finalized(F), HasGeneratedNodes(false) {
-    assert(!N->isSink());
-    Deferred.insert(N);
+  NodeBuilder(NodeBuilderContext &Ctx, bool F = true)
+    : C(Ctx), Finalized(F), HasGeneratedNodes(false) {
+    Deferred.insert(C.ContextPred);
   }
 
   /// Create a new builder using the parent builder's context.
-  NodeBuilder(ExplodedNode *N, const NodeBuilder &ParentBldr, bool F = true)
-    : BuilderPred(N), C(ParentBldr.C), Finalized(F), HasGeneratedNodes(false) {
-    assert(!N->isSink());
-    Deferred.insert(N);
+  NodeBuilder(const NodeBuilder &ParentBldr, bool F = true)
+    : C(ParentBldr.C), Finalized(F), HasGeneratedNodes(false) {
+    Deferred.insert(C.ContextPred);
   }
 
   virtual ~NodeBuilder() {}
@@ -269,8 +268,8 @@ public:
   /// visited on the exploded graph path.
   unsigned getCurrentBlockCount() const {
     return getBlockCounter().getNumVisited(
-                      BuilderPred->getLocationContext()->getCurrentStackFrame(),
-                      C.Block->getBlockID());
+                    C.ContextPred->getLocationContext()->getCurrentStackFrame(),
+                    C.Block->getBlockID());
   }
 };
 
@@ -363,7 +362,7 @@ public:
   }
 
   void importNodesFromBuilder(const NodeBuilder &NB) {
-    ExplodedNode *NBPred = const_cast<ExplodedNode*>(NB.BuilderPred);
+    ExplodedNode *NBPred = const_cast<ExplodedNode*>(NB.C.ContextPred);
     if (NB.hasGeneratedNodes()) {
       Deferred.erase(NBPred);
       Deferred.insert(NB.Deferred.begin(), NB.Deferred.end());
@@ -379,19 +378,19 @@ class BranchNodeBuilder: public NodeBuilder {
   bool InFeasibleFalse;
 
 public:
-  BranchNodeBuilder(ExplodedNode *Pred, NodeBuilderContext &C,
+  BranchNodeBuilder(NodeBuilderContext &C,
                     const CFGBlock *dstT, const CFGBlock *dstF)
-  : NodeBuilder(Pred, C), DstT(dstT), DstF(dstF),
+  : NodeBuilder(C), DstT(dstT), DstF(dstF),
     InFeasibleTrue(!DstT), InFeasibleFalse(!DstF) {}
 
   /// Create a new builder using the parent builder's context.
-  BranchNodeBuilder(ExplodedNode *Pred, BranchNodeBuilder &ParentBldr)
-  : NodeBuilder(Pred, ParentBldr), DstT(ParentBldr.DstT),
+  BranchNodeBuilder(BranchNodeBuilder &ParentBldr)
+  : NodeBuilder(ParentBldr), DstT(ParentBldr.DstT),
     DstF(ParentBldr.DstF),
     InFeasibleTrue(!DstT), InFeasibleFalse(!DstF) {}
 
   ExplodedNode *generateNode(const ProgramState *State, bool branch,
-                             ExplodedNode *Pred = 0);
+                             ExplodedNode *Pred);
 
   const CFGBlock *getTargetBlock(bool branch) const {
     return branch ? DstT : DstF;

lib/StaticAnalyzer/Core/CoreEngine.cpp

@@ -314,7 +314,7 @@ void CoreEngine::HandleBlockEntrance(const BlockEntrance &L,
 
   // Process the entrance of the block.
   if (CFGElement E = L.getFirstElement()) {
-    NodeBuilderContext Ctx(*this, L.getBlock());
+    NodeBuilderContext Ctx(*this, L.getBlock(), Pred);
     StmtNodeBuilder Builder(Pred, 0, Ctx);
     SubEng.processCFGElement(E, Builder, Pred);
   }
@@ -418,7 +418,7 @@ void CoreEngine::HandleBlockExit(const CFGBlock * B, ExplodedNode *Pred) {
 void CoreEngine::HandleBranch(const Stmt *Cond, const Stmt *Term, 
                                 const CFGBlock * B, ExplodedNode *Pred) {
   assert(B->succ_size() == 2);
-  NodeBuilderContext Ctx(*this, B);
+  NodeBuilderContext Ctx(*this, B, Pred);
   SubEng.processBranch(Cond, Term, Ctx, Pred,
                        *(B->succ_begin()), *(B->succ_begin()+1));
 }
@@ -431,7 +431,7 @@ void CoreEngine::HandlePostStmt(const CFGBlock *B, unsigned StmtIdx,
   if (StmtIdx == B->size())
     HandleBlockExit(B, Pred);
   else {
-    NodeBuilderContext Ctx(*this, B);
+    NodeBuilderContext Ctx(*this, B, Pred);
     StmtNodeBuilder Builder(Pred, StmtIdx, Ctx);
     SubEng.processCFGElement((*B)[StmtIdx], Builder, Pred);
   }
@@ -508,7 +508,7 @@ ExplodedNode* NodeBuilder::generateNodeImpl(const ProgramPoint &Loc,
 
 StmtNodeBuilder::StmtNodeBuilder(ExplodedNode *N, unsigned idx,
                                  NodeBuilderContext &Ctx)
-  : NodeBuilder(N, Ctx), Idx(idx),
+  : NodeBuilder(Ctx), Idx(idx),
     PurgingDeadSymbols(false), BuildSinks(false), hasGeneratedNode(false),
     PointKind(ProgramPoint::PostStmtKind), Tag(0) {
   Deferred.insert(N);
@@ -573,8 +573,6 @@ ExplodedNode *BranchNodeBuilder::generateNode(const ProgramState *State,
   if (!isFeasible(branch))
     return NULL;
 
-  if (!NodePred)
-    NodePred = BuilderPred;
   ProgramPoint Loc = BlockEdge(C.Block, branch ? DstT:DstF,
                                NodePred->getLocationContext());
   ExplodedNode *Succ = generateNodeImpl(Loc, State, NodePred);

lib/StaticAnalyzer/Core/ExprEngine.cpp

@@ -949,7 +949,7 @@ void ExprEngine::processBranch(const Stmt *Condition, const Stmt *Term,
 
   // Check for NULL conditions; e.g. "for(;;)"
   if (!Condition) {
-    BranchNodeBuilder NullCondBldr(Pred, BldCtx, DstT, DstF);
+    BranchNodeBuilder NullCondBldr(BldCtx, DstT, DstF);
     NullCondBldr.markInfeasible(false);
     NullCondBldr.generateNode(Pred->getState(), true, Pred);
     Engine.enqueue(NullCondBldr);
@@ -960,7 +960,7 @@ void ExprEngine::processBranch(const Stmt *Condition, const Stmt *Term,
                                 Condition->getLocStart(),
                                 "Error evaluating branch");
 
-  NodeBuilder CheckerBldr(Pred, BldCtx);
+  NodeBuilder CheckerBldr(BldCtx);
   getCheckerManager().runCheckersForBranchCondition(Condition, CheckerBldr,
                                                     Pred, *this);
 
@@ -971,7 +971,7 @@ void ExprEngine::processBranch(const Stmt *Condition, const Stmt *Term,
     if (PredI->isSink())
       continue;
 
-    BranchNodeBuilder builder(PredI, BldCtx, DstT, DstF);
+    BranchNodeBuilder builder(BldCtx, DstT, DstF);
     const ProgramState *PrevState = Pred->getState();
     SVal X = PrevState->getSVal(Condition);