[PATCH] D61260: [clang-tidy] Extend bugprone-sizeof-expression to check sizeof(pointers to structures)

[Balogh, Ádám via Phabricator via cfe-commits]

baloghadamsoftware created this revision.
baloghadamsoftware added reviewers: alexfh, aaron.ballman, lebedev.ri, JonasToth.
baloghadamsoftware added a project: clang-tools-extra.
Herald added subscribers: gamesh411, rnkovacs.
Herald added a project: clang.

Accidentally taking the size of a struct-pointer type or a value of this type is more common than explicitly using the `&` operator for the value. This patch extends the check to include these cases.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D61260

Files:
  clang-tidy/bugprone/SizeofExpressionCheck.cpp
  test/clang-tidy/bugprone-sizeof-expression.cpp


Index: test/clang-tidy/bugprone-sizeof-expression.cpp
===================================================================
--- test/clang-tidy/bugprone-sizeof-expression.cpp
+++ test/clang-tidy/bugprone-sizeof-expression.cpp
@@ -193,11 +193,13 @@
     Array10* ptr;
   };
   typedef const MyStruct TMyStruct;
+  typedef const MyStruct *PMyStruct;
 
   static TMyStruct kGlocalMyStruct = {};
   static TMyStruct volatile * kGlocalMyStructPtr = &kGlocalMyStruct;
 
   MyStruct S;
+  PMyStruct PS;
   Array10 A10;
 
   int sum = 0;
@@ -225,6 +227,12 @@
   // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
   sum += sizeof(&S);
   // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  sum += sizeof(MyStruct*);
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  sum += sizeof(PMyStruct);
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  sum += sizeof(PS);
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
   sum += sizeof(&A10);
   // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
 
Index: clang-tidy/bugprone/SizeofExpressionCheck.cpp
===================================================================
--- clang-tidy/bugprone/SizeofExpressionCheck.cpp
+++ clang-tidy/bugprone/SizeofExpressionCheck.cpp
@@ -142,10 +142,17 @@
       unaryOperator(hasOperatorName("&"),
                     hasUnaryOperand(ignoringParenImpCasts(expr(
                         hasType(qualType(hasCanonicalType(recordType())))))));
+  const auto PointerToStructType = type(hasUnqualifiedDesugaredType(
+      pointerType(pointee(recordType()))));
+  const auto PointerToStructExpr = expr(ignoringParenImpCasts(expr(
+      hasType(qualType(hasCanonicalType(PointerToStructType))),
+      unless(cxxThisExpr()))));
 
   Finder->addMatcher(
-      expr(sizeOfExpr(has(expr(ignoringParenImpCasts(
-               anyOf(ArrayCastExpr, PointerToArrayExpr, StructAddrOfExpr))))))
+      expr(anyOf(sizeOfExpr(has(expr(ignoringParenImpCasts(
+               anyOf(ArrayCastExpr, PointerToArrayExpr, StructAddrOfExpr,
+                     PointerToStructExpr))))),
+                            sizeOfExpr(has(PointerToStructType))))
           .bind("sizeof-pointer-to-aggregate"),
       this);
 


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