[clang][dataflow] Propagate storage location of compound assignment operators. (#94332)

To avoid generating unnecessary values, we don't create a new value but
instead
leave it to the specific analysis to do this if desired.

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Analysis/FlowSensitive/Transfer.cpp b/clang/lib/Analysis/FlowSensitive/Transfer.cpp
index d161b23..8109ac6 100644
--- a/clang/lib/Analysis/FlowSensitive/Transfer.cpp
+++ b/clang/lib/Analysis/FlowSensitive/Transfer.cpp
@@ -147,6 +147,13 @@ public:
     const Expr *RHS = S->getRHS();
     assert(RHS != nullptr);
 
+    // Do compound assignments up-front, as there are so many of them and we
+    // don't want to list all of them in the switch statement below.
+    // To avoid generating unnecessary values, we don't create a new value but
+    // instead leave it to the specific analysis to do this if desired.
+    if (S->isCompoundAssignmentOp())
+      propagateStorageLocation(*S->getLHS(), *S, Env);
+
     switch (S->getOpcode()) {
     case BO_Assign: {
       auto *LHSLoc = Env.getStorageLocation(*LHS);