[-Wunsafe-buffer-usage][NFC] Rename PointerAssignment gadget to PtrToPtrAssignment

Author: jkorous-apple

clang/include/clang/Analysis/Analyses/UnsafeBufferUsageGadgets.def

@@ -45,7 +45,7 @@ FIXABLE_GADGET(UPCAddressofArraySubscript) // '&DRE[any]' in an Unspecified Poin
 FIXABLE_GADGET(UPCStandalonePointer)
 FIXABLE_GADGET(UPCPreIncrement)            // '++Ptr' in an Unspecified Pointer Context
 FIXABLE_GADGET(UUCAddAssign)            // 'Ptr += n' in an Unspecified Untyped Context
-FIXABLE_GADGET(PointerAssignment)
+FIXABLE_GADGET(PtrToPtrAssignment)
 FIXABLE_GADGET(PointerInit)
 
 #undef FIXABLE_GADGET

clang/lib/Analysis/UnsafeBufferUsage.cpp

@@ -801,21 +801,22 @@ class PointerInitGadget : public FixableGadget {
 ///  \code
 ///  p = q;
 ///  \endcode
-class PointerAssignmentGadget : public FixableGadget {
+/// where both `p` and `q` are pointers.
+class PtrToPtrAssignmentGadget : public FixableGadget {
 private:
   static constexpr const char *const PointerAssignLHSTag = "ptrLHS";
   static constexpr const char *const PointerAssignRHSTag = "ptrRHS";
   const DeclRefExpr * PtrLHS;         // the LHS pointer expression in `PA`
   const DeclRefExpr * PtrRHS;         // the RHS pointer expression in `PA`
 
 public:
-  PointerAssignmentGadget(const MatchFinder::MatchResult &Result)
-      : FixableGadget(Kind::PointerAssignment),
+  PtrToPtrAssignmentGadget(const MatchFinder::MatchResult &Result)
+      : FixableGadget(Kind::PtrToPtrAssignment),
     PtrLHS(Result.Nodes.getNodeAs<DeclRefExpr>(PointerAssignLHSTag)),
     PtrRHS(Result.Nodes.getNodeAs<DeclRefExpr>(PointerAssignRHSTag)) {}
 
   static bool classof(const Gadget *G) {
-    return G->getKind() == Kind::PointerAssignment;
+    return G->getKind() == Kind::PtrToPtrAssignment;
   }
 
   static Matcher matcher() {
@@ -1473,7 +1474,7 @@ bool clang::internal::anyConflict(const SmallVectorImpl<FixItHint> &FixIts,
 }
 
 std::optional<FixItList>
-PointerAssignmentGadget::getFixits(const FixitStrategy &S) const {
+PtrToPtrAssignmentGadget::getFixits(const FixitStrategy &S) const {
   const auto *LeftVD = cast<VarDecl>(PtrLHS->getDecl());
   const auto *RightVD = cast<VarDecl>(PtrRHS->getDecl());
   switch (S.lookup(LeftVD)) {

clang/test/SemaCXX/warn-unsafe-buffer-usage-debug.cpp

@@ -53,7 +53,7 @@ void unclaimed_use() {
 void implied_unclaimed_var(int *b) {  // expected-warning{{'b' is an unsafe pointer used for buffer access}}
   int *a = new int[3];  // expected-warning{{'a' is an unsafe pointer used for buffer access}}
   a[4] = 7;  // expected-note{{used in buffer access here}}
-  a = b;  // debug-note{{safe buffers debug: gadget 'PointerAssignment' refused to produce a fix}}
+  a = b;  // debug-note{{safe buffers debug: gadget 'PtrToPtrAssignment' refused to produce a fix}}
   b++;  // expected-note{{used in pointer arithmetic here}} \
         // debug-note{{safe buffers debug: failed to produce fixit for 'b' : has an unclaimed use}}
 }