[PATCH] D127865: [clang][dataflow] Make `Value` and `StorageLocation` non-copyable

[Stanislav Gatev via Phabricator via cfe-commits]

sgatev created this revision.
sgatev added reviewers: ymandel, xazax.hun, gribozavr2.
Herald added subscribers: martong, tschuett, rnkovacs.
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sgatev requested review of this revision.
Herald added a project: clang.

This makes it harder to misuse APIs that return references by
accidentally copying the results which could happen when assigning the
them to variables declared as `auto`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127865

Files:
  clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
  clang/include/clang/Analysis/FlowSensitive/Value.h


Index: clang/include/clang/Analysis/FlowSensitive/Value.h
===================================================================
--- clang/include/clang/Analysis/FlowSensitive/Value.h
+++ clang/include/clang/Analysis/FlowSensitive/Value.h
@@ -47,6 +47,12 @@
 
   explicit Value(Kind ValKind) : ValKind(ValKind) {}
 
+  // Non-copyable because addresses of values are used as their identities
+  // throughout framework and user code. The framework is responsible for
+  // construction and destruction of values.
+  Value(const Value &) = delete;
+  Value &operator=(const Value &) = delete;
+
   virtual ~Value() = default;
 
   Kind getKind() const { return ValKind; }
Index: clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
===================================================================
--- clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
+++ clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
@@ -31,6 +31,12 @@
 
   StorageLocation(Kind LocKind, QualType Type) : LocKind(LocKind), Type(Type) {}
 
+  // Non-copyable because addresses of storage locations are used as their
+  // identities throughout framework and user code. The framework is responsible
+  // for construction and destruction of storage locations.
+  StorageLocation(const StorageLocation &) = delete;
+  StorageLocation &operator=(const StorageLocation &) = delete;
+
   virtual ~StorageLocation() = default;
 
   Kind getKind() const { return LocKind; }


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