[PATCH] D128716: [analyzer] Fix BindingDecl evaluation for reference types.

[Domján Dániel via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG9d2e830737bc: [analyzer] Fix BindingDecl evaluation for reference types (authored by isuckatcs).
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128716/new/

https://reviews.llvm.org/D128716

Files:
  clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
  clang/test/Analysis/structured_bindings.cpp


Index: clang/test/Analysis/structured_bindings.cpp
===================================================================
--- clang/test/Analysis/structured_bindings.cpp
+++ clang/test/Analysis/structured_bindings.cpp
@@ -1,9 +1,32 @@
-// RUN: %clang_analyze_cc1 -std=c++17 -analyzer-checker=core -verify %s
+// RUN: %clang_analyze_cc1 -std=c++17 -analyzer-checker=core,debug.ExprInspection -verify %s
+
+void clang_analyzer_eval(bool);
 
 struct s { int a; };
 int foo() {
-    auto[a] = s{1}; // FIXME: proper modelling
-    if (a) {
-    }
+  auto [a] = s{1};
+  clang_analyzer_eval(a == 1); // expected-warning{{TRUE}}
 } // expected-warning{{non-void function does not return a value}}
 
+struct s2 {
+  int &x;
+};
+
+int *foo2(s2 in) {
+  auto [a] = in;
+  return &a;
+}
+
+void bar() {
+  int i = 1;
+  s2 a{i};
+
+  auto *x = foo2(a);
+
+  clang_analyzer_eval(*x == i); // expected-warning{{TRUE}}
+
+  *x = 2;
+
+  clang_analyzer_eval(*x == 2); // expected-warning{{TRUE}}
+  clang_analyzer_eval(i == 2);  // expected-warning{{TRUE}}
+}
Index: clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -2630,6 +2630,9 @@
     } else
       llvm_unreachable("An unknown case of structured binding encountered!");
 
+    if (BD->getType()->isReferenceType())
+      V = state->getSVal(V.getAsRegion());
+
     Bldr.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V), nullptr,
                       ProgramPoint::PostLValueKind);
 


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