[clang-tools-extra] efa4dbc - [clang-tidy] performance-unnecessary-copy-initialization: Look at the canonical type when checking for aliases.

[Felix Berger via cfe-commits]

Author: Felix Berger
Date: 2021-06-09T16:36:53-04:00
New Revision: efa4dbc32ca9b7f3319edbcc6ac502ea962c8f0a

URL: https://github.com/llvm/llvm-project/commit/efa4dbc32ca9b7f3319edbcc6ac502ea962c8f0a
DIFF: https://github.com/llvm/llvm-project/commit/efa4dbc32ca9b7f3319edbcc6ac502ea962c8f0a.diff

LOG: [clang-tidy] performance-unnecessary-copy-initialization: Look at the canonical type when checking for aliases.

This fixes a false positive case where for instance a pointer is obtained and declared using `auto`.

Differential Revision: https://reviews.llvm.org/D103018

Reviewed-by: ymandel

Added: 
    

Modified: 
    clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp
    clang-tools-extra/test/clang-tidy/checkers/performance-unnecessary-copy-initialization.cpp

Removed: 
    


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diff  --git a/clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp b/clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp
index 57a2310e779fb..27ce36e49a073 100644
--- a/clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp
+++ b/clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp
@@ -100,7 +100,7 @@ static bool isInitializingVariableImmutable(const VarDecl &InitializingVar,
   if (!isOnlyUsedAsConst(InitializingVar, BlockStmt, Context))
     return false;
 
-  QualType T = InitializingVar.getType();
+  QualType T = InitializingVar.getType().getCanonicalType();
   // The variable is a value type and we know it is only used as const. Safe
   // to reference it and avoid the copy.
   if (!isa<ReferenceType, PointerType>(T))

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/performance-unnecessary-copy-initialization.cpp b/clang-tools-extra/test/clang-tidy/checkers/performance-unnecessary-copy-initialization.cpp
index 3a4c3ec869e1c..e894f84f11d8c 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/performance-unnecessary-copy-initialization.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/performance-unnecessary-copy-initialization.cpp
@@ -4,6 +4,7 @@ struct ExpensiveToCopyType {
   ExpensiveToCopyType();
   virtual ~ExpensiveToCopyType();
   const ExpensiveToCopyType &reference() const;
+  const ExpensiveToCopyType *pointer() const;
   void nonConstMethod();
   bool constMethod() const;
 };
@@ -548,6 +549,25 @@ void negativeCopiedFromGetterOfReferenceToModifiedVar() {
   Orig.nonConstMethod();
 }
 
+void negativeAliasNonCanonicalPointerType() {
+  ExpensiveToCopyType Orig;
+  // The use of auto here hides that the type is a pointer type. The check needs
+  // to look at the canonical type to detect the aliasing through this pointer.
+  const auto Pointer = Orig.pointer();
+  const auto NecessaryCopy = Pointer->reference();
+  Orig.nonConstMethod();
+}
+
+void negativeAliasTypedefedType() {
+  typedef const ExpensiveToCopyType &ReferenceType;
+  ExpensiveToCopyType Orig;
+  // The typedef hides the fact that this is a reference type. The check needs
+  // to look at the canonical type to detect the aliasing.
+  ReferenceType Ref = Orig.reference();
+  const auto NecessaryCopy = Ref.reference();
+  Orig.nonConstMethod();
+}
+
 void positiveCopiedFromGetterOfReferenceToConstVar() {
   ExpensiveToCopyType Orig;
   const auto &Ref = Orig.reference();