[PATCH] D121694: [clang][dataflow] Allow disabling built-in transfer functions for CFG terminators

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

ymandel created this revision.
ymandel added reviewers: sgatev, xazax.hun.
Herald added subscribers: tschuett, steakhal, rnkovacs.
Herald added a project: All.
ymandel requested review of this revision.
Herald added a project: clang.

Terminators are handled specially in the transfer functions so we need an
additional check on whether the analysis has disabled built-in transfer
functions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121694

Files:
  clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp


Index: clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
+++ clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
@@ -170,6 +170,8 @@
   }
 
   llvm::Optional<TypeErasedDataflowAnalysisState> MaybeState;
+  bool ApplyBuiltinTransfer = Analysis.applyBuiltinTransfer();
+
   for (const CFGBlock *Pred : Preds) {
     // Skip if the `Block` is unreachable or control flow cannot get past it.
     if (!Pred || Pred->hasNoReturnElement())
@@ -183,11 +185,13 @@
       continue;
 
     TypeErasedDataflowAnalysisState PredState = MaybePredState.getValue();
-    if (const Stmt *PredTerminatorStmt = Pred->getTerminatorStmt()) {
-      const StmtToEnvMapImpl StmtToEnv(CFCtx, BlockStates);
-      TerminatorVisitor(StmtToEnv, PredState.Env,
-                        blockIndexInPredecessor(*Pred, Block))
-          .Visit(PredTerminatorStmt);
+    if (ApplyBuiltinTransfer) {
+      if (const Stmt *PredTerminatorStmt = Pred->getTerminatorStmt()) {
+        const StmtToEnvMapImpl StmtToEnv(CFCtx, BlockStates);
+        TerminatorVisitor(StmtToEnv, PredState.Env,
+                          blockIndexInPredecessor(*Pred, Block))
+            .Visit(PredTerminatorStmt);
+      }
     }
 
     if (MaybeState.hasValue()) {


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