[PATCH] D124540: [clang][dataflow] Perform structural comparison of indirection values in `join`.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG6c81b5723716: [clang][dataflow] Perform structural comparison of indirection values in `join`. (authored by ymandel).

Changed prior to commit:
  https://reviews.llvm.org/D124540?vs=425567&id=425849#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124540/new/

https://reviews.llvm.org/D124540

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


Index: clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
+++ clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
@@ -21,6 +21,7 @@
 #include "clang/Analysis/FlowSensitive/Value.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
+#include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <cassert>
 #include <memory>
@@ -105,6 +106,15 @@
     return &MergedEnv.makeOr(*Expr1, *Expr2);
   }
 
+  // FIXME: add unit tests that cover this statement.
+  if (auto *IndVal1 = dyn_cast<IndirectionValue>(Val1)) {
+    auto *IndVal2 = cast<IndirectionValue>(Val2);
+    assert(IndVal1->getKind() == IndVal2->getKind());
+    if (&IndVal1->getPointeeLoc() == &IndVal2->getPointeeLoc()) {
+      return Val1;
+    }
+  }
+
   // FIXME: Consider destroying `MergedValue` immediately if `ValueModel::merge`
   // returns false to avoid storing unneeded values in `DACtx`.
   if (Value *MergedVal = MergedEnv.createValue(Type))


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